This document provides an overview of teaching electromagnetism, including describing permanent magnets and induced magnetism, magnetic fields from moving charges, how transformers and motors work, and Lenz's law of electromagnetic induction. It discusses challenges in teaching concepts like magnetic fields and the operation of motors. Key experiments are outlined to demonstrate topics like electromagnets, induction, and transformers. Common student misconceptions are also addressed.
1) Early scientists like Gilbert, Oersted, and Ampere discovered relationships between electricity and magnetism in the 1600s-1800s. Maxwell then unified these concepts into a mathematical theory of electromagnetism in the 1860s.
2) Electromagnetism describes the interaction between electric charges and currents with magnetic fields, and vice versa. Permanent magnets have magnetic domains inside that create their overall magnetic fields.
3) Electromagnetism is utilized in many modern technologies like motors, generators, and transformers to convert between electrical and mechanical systems using the forces between current-carrying conductors and magnetic fields.
Electricity, magnetism and electromagnetismairwave12
Atoms contain protons, electrons, and neutrons. Protons are positively charged, electrons are negatively charged, and they are located on the outer edges of atoms. The movement and concentration of electrons creates static electricity and electric currents. Static electricity builds up a charge without flowing, while electric current flows from high voltage to low voltage, such as through wires in a circuit. Current can be direct (DC) or alternating (AC). Magnets have north and south poles and magnetic fields that interact with electric fields through electromagnetic induction, which is the basis for technologies like electric motors, generators, and transformers.
Electric charges
Current
Potentialand its difference
Circuits
Heating effects
Magnetic effects
Magnetic Field Lines in straight and coiled conductors
Electromagnets
Electromagnetic Induction
Motors and Generators
Magnets have north and south poles and like poles repel while unlike poles attract. There are permanent magnets made from iron alloys and electric magnets created by running current through a coil of wire. The magnetic field around a magnet gets weaker with distance from its poles. Electromagnets are useful because their poles can be reversed by switching current direction. Motors use electromagnets and permanent magnets to convert electrical energy to mechanical motion via electromagnetic induction. Generators operate on the same principles but convert mechanical motion to electrical energy. Transformers increase or decrease voltage in power grids to safely deliver electricity to homes.
This document provides an overview of electromagnetism and its applications. It discusses the history of electricity and magnetism dating back to ancient times. It also describes the four main effects resulting from interactions between electric charges: attraction/repulsion based on charge and distance. Additionally, it covers the different types of magnetism including ferromagnetism, diamagnetism, and paramagnetism. The document outlines key concepts like magnetic fields, electromagnetic induction, and applications such as generators, motors, and transformers.
This document provides an overview of electromagnetism and its applications. It discusses the history of electricity and magnetism dating back to ancient times. It also describes the four main effects resulting from interactions between electric charges: attraction/repulsion based on charge and distance. Additionally, it covers the different types of magnetism including ferromagnetism, diamagnetism, and paramagnetism. The document outlines key concepts like magnetic fields, electromagnetic induction, and applications such as generators, motors, and transformers.
1) Early scientists like Gilbert, Oersted, and Ampere discovered relationships between electricity and magnetism in the 1600s-1800s. Maxwell then unified these concepts into a mathematical theory of electromagnetism in the 1860s.
2) Electromagnetism describes the interaction between electric charges and currents with magnetic fields, and vice versa. Permanent magnets have magnetic domains inside that create their overall magnetic fields.
3) Electromagnetism is utilized in many modern technologies like motors, generators, and transformers to convert between electrical and mechanical systems using the forces between current-carrying conductors and magnetic fields.
Electricity, magnetism and electromagnetismairwave12
Atoms contain protons, electrons, and neutrons. Protons are positively charged, electrons are negatively charged, and they are located on the outer edges of atoms. The movement and concentration of electrons creates static electricity and electric currents. Static electricity builds up a charge without flowing, while electric current flows from high voltage to low voltage, such as through wires in a circuit. Current can be direct (DC) or alternating (AC). Magnets have north and south poles and magnetic fields that interact with electric fields through electromagnetic induction, which is the basis for technologies like electric motors, generators, and transformers.
Electric charges
Current
Potentialand its difference
Circuits
Heating effects
Magnetic effects
Magnetic Field Lines in straight and coiled conductors
Electromagnets
Electromagnetic Induction
Motors and Generators
Magnets have north and south poles and like poles repel while unlike poles attract. There are permanent magnets made from iron alloys and electric magnets created by running current through a coil of wire. The magnetic field around a magnet gets weaker with distance from its poles. Electromagnets are useful because their poles can be reversed by switching current direction. Motors use electromagnets and permanent magnets to convert electrical energy to mechanical motion via electromagnetic induction. Generators operate on the same principles but convert mechanical motion to electrical energy. Transformers increase or decrease voltage in power grids to safely deliver electricity to homes.
This document provides an overview of electromagnetism and its applications. It discusses the history of electricity and magnetism dating back to ancient times. It also describes the four main effects resulting from interactions between electric charges: attraction/repulsion based on charge and distance. Additionally, it covers the different types of magnetism including ferromagnetism, diamagnetism, and paramagnetism. The document outlines key concepts like magnetic fields, electromagnetic induction, and applications such as generators, motors, and transformers.
This document provides an overview of electromagnetism and its applications. It discusses the history of electricity and magnetism dating back to ancient times. It also describes the four main effects resulting from interactions between electric charges: attraction/repulsion based on charge and distance. Additionally, it covers the different types of magnetism including ferromagnetism, diamagnetism, and paramagnetism. The document outlines key concepts like magnetic fields, electromagnetic induction, and applications such as generators, motors, and transformers.
This document discusses magnetic forces and fields. It describes three types of magnets: ferromagnetic, paramagnetic, and electromagnets. An electromagnet becomes magnetic under the influence of electric current flowing through a wire and is the basis for electric motors. The Earth acts as a giant electromagnet due to electric currents in its liquid outer core generating a magnetic field, which protects us from solar particles and causes the aurora borealis.
The document discusses electromagnetic fields (EMF). It begins by defining EMF as a physical field produced by moving electrically charged objects that affects behavior of nearby charged objects. It notes EMF extends indefinitely through space and is one of four fundamental forces. The field combines electric fields from stationary charges and magnetic fields from moving charges. The document then provides examples of uses for electromagnets and discusses electromagnetic induction, transformers, exposure to EMF, and contrasts EMF with gravitational fields.
This document provides an overview of magnetism and magnetic circuits. It discusses [1] permanent magnets and how they produce magnetic fields, [2] how currents produce electromagnetic fields based on the right-hand rule, [3] how coils can be used to create electromagnetic fields similar to bar magnets, and [4] how magnetic circuits work analogously to electric circuits using concepts like magnetic flux, flux density, magnetomotive force, reluctance, and permeability. The document provides examples of calculating these magnetic properties.
Electrical and Magnetic force fileds.pdfChadWood16
This document provides an overview of electrical and magnetic force fields. It discusses:
1) The electrical force and how it is balanced by quantum mechanics in atoms.
2) Electric and magnetic fields, which are vector fields associated with every point in space.
3) Key characteristics of vector fields including flux and circulation.
4) The laws of electromagnetism, including how electric and magnetic fields interact.
5) Different types of magnetism exhibited by materials, including diamagnetism, paramagnetism, and ferromagnetism in iron. Quantum mechanics is needed to fully understand magnetic effects.
This document provides an overview of electromagnetism and electromagnetic induction. It defines key terms like ferromagnetic materials, magnetic field, Maxwell's screw rule, and more. It describes the pattern and direction of magnetic fields due to current in a straight wire, circular coil, and solenoid. It also discusses electromagnets, electromagnetic applications, forces on current-carrying conductors, DC motors, and electromagnetic induction including Faraday's law and Lenz's law. The document concludes by covering magnetic flux, transformers, alternating current, and electricity transmission.
The document discusses electromagnetic induction, which is the production of an electromotive force across a conductor when it is exposed to a varying magnetic field. It was discovered by Michael Faraday and Joseph Henry in 1831. Faraday's law of induction states that the induced electromotive force in a closed circuit is equal to the rate of change of the magnetic flux through the circuit. Applications of electromagnetic induction include electric generators, magnetic flow meters, induction motors, and transformers. Eddy currents in conductors can be reduced through the use of thin laminated sheets in devices like electromagnets.
The document discusses electromagnetic induction, which is the production of an electromotive force across a conductor when it is exposed to a varying magnetic field. It was discovered by Michael Faraday and Joseph Henry in 1831. Faraday's law of induction states that the induced electromotive force in a closed circuit is equal to the rate of change of the magnetic flux through the circuit. Applications of electromagnetic induction include electric generators, magnetic flow meters, induction motors, and transformers. Eddy currents in conductors can be reduced through the use of thin laminated sheets in devices like electromagnets.
The document discusses electromagnetic induction and transformers. It explains that an electromotive force (emf) can be induced in a conductor by moving it through a magnetic field or by moving a magnetic field near the conductor. The magnitude of the induced emf depends on factors like the speed and strength of movement and the number of turns in the conductor. It also distinguishes between direct current (DC), where current flows in one direction, and alternating current (AC) from the mains, which constantly changes direction at a frequency of 50 Hz. Transformers are described as devices that use electromagnetic induction to change voltage levels for transmission or use, operating on the principle that the ratio of voltages equals the ratio of turns in the primary and secondary
ELECTROMAGNETISM INTRODUCTION IN RADIOLOGYairamariedm09
1. Electricity and magnetism are different aspects of the same electromagnetic force. The development of the battery led to increased understanding of electromagnetic phenomena.
2. The battery was discovered in the 1700s by Alessandro Volta and produces a feeble electric current using zinc and copper plates. Modern batteries use a carbon rod positive electrode surrounded by an electrolytic paste in a negative zinc can.
3. Hans Oersted's 1820 experiment demonstrated that an electric current produces a magnetic field, providing evidence of a direct link between electric and magnetic phenomena. This established that electricity and magnetism are different aspects of the same electromagnetic force.
The document discusses magnetic circuits and materials. It covers the course objectives which are to understand the construction and working principles of electrical machines and transformers, and to apply principles of DC machines and transformers to analyze characteristics, losses, performance and efficiency. The overview discusses magnetic circuits, laws governing them, flux linkage, inductance, energy, induced EMF, losses, and types of magnetic field systems. It also discusses DC machines, transformers, their construction, principles of operation, characteristics, testing, and losses. Faraday's laws of electromagnetic induction and concepts like mutual induction, Lenz's law, and Fleming's rules are explained. Key terms discussed include reluctance, permeance, induced EMF, self and mutually induced EMF.
The document provides an overview of magnetics and magnetic circuits. It discusses key topics including:
- The basic principles of electromagnetism and how magnetic fields are produced by current-carrying conductors.
- Properties of magnetic fields such as magnetic lines of force and their behavior.
- Magnetic materials and their properties including ferromagnetic, paramagnetic, and diamagnetic materials.
- Key concepts in magnetic circuits such as magnetic flux, flux density, reluctance, permeability, and their analogies to electric circuits using concepts like voltage, current, resistance.
The document discusses magnetism and electricity concepts including:
- Iron, nickel, and cobalt have the greatest magnetic permeability.
- Permanent magnet examples include ceramic bars, fridge magnets, and neodymium discs.
- Temporary magnets include induced paper clips and electromagnets.
- Earth's magnetic field is generated by a dynamo effect in its solid iron inner core.
- Moving a magnet near a wire or changing the magnetic field around a wire induces electric current in the wire.
Electrons located on the outer edges of atoms can be moved, creating an electric charge. Static electricity occurs when there is a buildup of electric charge on an object's surface without flowing. Current electricity is the flowing of electrons through a conductor. There are two types of currents - direct current where electrons flow in one direction and alternating current where electrons reverse direction. Magnets have north and south poles and magnetic fields with field lines. Electromagnetism is the interaction between electric and magnetic fields where a moving electric charge creates a magnetic field and a changing magnetic field induces electric current in a conductor.
This document provides information about electromagnetism and various electromagnetic concepts and devices. It begins by defining electromagnetism as the fundamental force consisting of electricity and magnetism. It then discusses magnetic fields, including how they are represented by field lines. It describes how electromagnets are devices that produce magnetic fields when electricity is applied. It discusses various electromagnetic concepts like Ampere's law and how changing electric and magnetic fields interact. It provides examples of electromagnetic devices like motors, generators, and relays. It describes applications of electromagnetism in devices commonly found in homes and schools.
This document provides an overview of magnetism and magnetic fields. It begins with an introductory activity on magnetism facts. The document then outlines topics to be covered, including magnetic fields, forces on moving charges and currents, and properties of electromagnets and ferromagnets. Examples are provided to demonstrate how to calculate magnetic field strength and forces. The key points are that magnets produce magnetic fields with north and south poles; magnetic fields exert forces on moving charges; and currents generate magnetic fields according to Ampere's law.
This document contains information about electricity and magnetism concepts including:
1. It defines key equations for electric potential, current, resistance, and force due to magnetic fields.
2. It discusses how moving charges experience forces in magnetic fields, and how this relates to phenomena like the aurora borealis and the operation of motors and generators.
3. It introduces concepts like induced currents and how changing magnetic fields can generate electric currents and voltages in conductors according to Lenz's law, which has applications in technologies like electric generators.
The document discusses different types of meters used to measure electric voltage and current, including moving iron, hot wire, and thermocouple meters. It then provides details on the construction and working principles of moving iron meters, which use magnetic forces to deflect a pointer on a scale. The document also covers electromagnetic induction, explaining how a changing magnetic field can induce voltage in a conductor. Key concepts discussed include mutual and self induction, inductive reactance, eddy currents, and the workings of transformers, autotransformers, and dynamos based on electromagnetic induction.
This document provides an overview of basics of electrical engineering, specifically focusing on magnets and magnetism. It defines different types of magnets including permanent magnets, temporary magnets, and electromagnets. It describes magnetic domains, magnetic dipoles, magnetic fields, flux, and various laws of magnetism including Biot-Savart law, Ampere's law, force law, and Faraday's law. It also discusses applications such as solenoids, transformers, and generators.
The document outlines the objectives, outcomes, and units of an Elements of Electrical and Electronics Engineering course. The objectives are to study basic electric circuits, electrical machines, electrical energy applications, and semiconductor devices. The outcomes are to analyze electrical circuits, test electric machines, understand electric power uses, and apply semiconductor principles. The six units cover topics like electrical circuits, DC machines, AC circuits, AC machines, power systems, and electronics devices and digital circuits. Materials for electrical engineering are classified as conductors, semiconductors, insulators, and magnetic materials based on their properties and applications. Circuit elements can be categorized as linear/nonlinear, active/passive, and bilateral/unilateral.
This document discusses magnetic forces and fields. It describes three types of magnets: ferromagnetic, paramagnetic, and electromagnets. An electromagnet becomes magnetic under the influence of electric current flowing through a wire and is the basis for electric motors. The Earth acts as a giant electromagnet due to electric currents in its liquid outer core generating a magnetic field, which protects us from solar particles and causes the aurora borealis.
The document discusses electromagnetic fields (EMF). It begins by defining EMF as a physical field produced by moving electrically charged objects that affects behavior of nearby charged objects. It notes EMF extends indefinitely through space and is one of four fundamental forces. The field combines electric fields from stationary charges and magnetic fields from moving charges. The document then provides examples of uses for electromagnets and discusses electromagnetic induction, transformers, exposure to EMF, and contrasts EMF with gravitational fields.
This document provides an overview of magnetism and magnetic circuits. It discusses [1] permanent magnets and how they produce magnetic fields, [2] how currents produce electromagnetic fields based on the right-hand rule, [3] how coils can be used to create electromagnetic fields similar to bar magnets, and [4] how magnetic circuits work analogously to electric circuits using concepts like magnetic flux, flux density, magnetomotive force, reluctance, and permeability. The document provides examples of calculating these magnetic properties.
Electrical and Magnetic force fileds.pdfChadWood16
This document provides an overview of electrical and magnetic force fields. It discusses:
1) The electrical force and how it is balanced by quantum mechanics in atoms.
2) Electric and magnetic fields, which are vector fields associated with every point in space.
3) Key characteristics of vector fields including flux and circulation.
4) The laws of electromagnetism, including how electric and magnetic fields interact.
5) Different types of magnetism exhibited by materials, including diamagnetism, paramagnetism, and ferromagnetism in iron. Quantum mechanics is needed to fully understand magnetic effects.
This document provides an overview of electromagnetism and electromagnetic induction. It defines key terms like ferromagnetic materials, magnetic field, Maxwell's screw rule, and more. It describes the pattern and direction of magnetic fields due to current in a straight wire, circular coil, and solenoid. It also discusses electromagnets, electromagnetic applications, forces on current-carrying conductors, DC motors, and electromagnetic induction including Faraday's law and Lenz's law. The document concludes by covering magnetic flux, transformers, alternating current, and electricity transmission.
The document discusses electromagnetic induction, which is the production of an electromotive force across a conductor when it is exposed to a varying magnetic field. It was discovered by Michael Faraday and Joseph Henry in 1831. Faraday's law of induction states that the induced electromotive force in a closed circuit is equal to the rate of change of the magnetic flux through the circuit. Applications of electromagnetic induction include electric generators, magnetic flow meters, induction motors, and transformers. Eddy currents in conductors can be reduced through the use of thin laminated sheets in devices like electromagnets.
The document discusses electromagnetic induction, which is the production of an electromotive force across a conductor when it is exposed to a varying magnetic field. It was discovered by Michael Faraday and Joseph Henry in 1831. Faraday's law of induction states that the induced electromotive force in a closed circuit is equal to the rate of change of the magnetic flux through the circuit. Applications of electromagnetic induction include electric generators, magnetic flow meters, induction motors, and transformers. Eddy currents in conductors can be reduced through the use of thin laminated sheets in devices like electromagnets.
The document discusses electromagnetic induction and transformers. It explains that an electromotive force (emf) can be induced in a conductor by moving it through a magnetic field or by moving a magnetic field near the conductor. The magnitude of the induced emf depends on factors like the speed and strength of movement and the number of turns in the conductor. It also distinguishes between direct current (DC), where current flows in one direction, and alternating current (AC) from the mains, which constantly changes direction at a frequency of 50 Hz. Transformers are described as devices that use electromagnetic induction to change voltage levels for transmission or use, operating on the principle that the ratio of voltages equals the ratio of turns in the primary and secondary
ELECTROMAGNETISM INTRODUCTION IN RADIOLOGYairamariedm09
1. Electricity and magnetism are different aspects of the same electromagnetic force. The development of the battery led to increased understanding of electromagnetic phenomena.
2. The battery was discovered in the 1700s by Alessandro Volta and produces a feeble electric current using zinc and copper plates. Modern batteries use a carbon rod positive electrode surrounded by an electrolytic paste in a negative zinc can.
3. Hans Oersted's 1820 experiment demonstrated that an electric current produces a magnetic field, providing evidence of a direct link between electric and magnetic phenomena. This established that electricity and magnetism are different aspects of the same electromagnetic force.
The document discusses magnetic circuits and materials. It covers the course objectives which are to understand the construction and working principles of electrical machines and transformers, and to apply principles of DC machines and transformers to analyze characteristics, losses, performance and efficiency. The overview discusses magnetic circuits, laws governing them, flux linkage, inductance, energy, induced EMF, losses, and types of magnetic field systems. It also discusses DC machines, transformers, their construction, principles of operation, characteristics, testing, and losses. Faraday's laws of electromagnetic induction and concepts like mutual induction, Lenz's law, and Fleming's rules are explained. Key terms discussed include reluctance, permeance, induced EMF, self and mutually induced EMF.
The document provides an overview of magnetics and magnetic circuits. It discusses key topics including:
- The basic principles of electromagnetism and how magnetic fields are produced by current-carrying conductors.
- Properties of magnetic fields such as magnetic lines of force and their behavior.
- Magnetic materials and their properties including ferromagnetic, paramagnetic, and diamagnetic materials.
- Key concepts in magnetic circuits such as magnetic flux, flux density, reluctance, permeability, and their analogies to electric circuits using concepts like voltage, current, resistance.
The document discusses magnetism and electricity concepts including:
- Iron, nickel, and cobalt have the greatest magnetic permeability.
- Permanent magnet examples include ceramic bars, fridge magnets, and neodymium discs.
- Temporary magnets include induced paper clips and electromagnets.
- Earth's magnetic field is generated by a dynamo effect in its solid iron inner core.
- Moving a magnet near a wire or changing the magnetic field around a wire induces electric current in the wire.
Electrons located on the outer edges of atoms can be moved, creating an electric charge. Static electricity occurs when there is a buildup of electric charge on an object's surface without flowing. Current electricity is the flowing of electrons through a conductor. There are two types of currents - direct current where electrons flow in one direction and alternating current where electrons reverse direction. Magnets have north and south poles and magnetic fields with field lines. Electromagnetism is the interaction between electric and magnetic fields where a moving electric charge creates a magnetic field and a changing magnetic field induces electric current in a conductor.
This document provides information about electromagnetism and various electromagnetic concepts and devices. It begins by defining electromagnetism as the fundamental force consisting of electricity and magnetism. It then discusses magnetic fields, including how they are represented by field lines. It describes how electromagnets are devices that produce magnetic fields when electricity is applied. It discusses various electromagnetic concepts like Ampere's law and how changing electric and magnetic fields interact. It provides examples of electromagnetic devices like motors, generators, and relays. It describes applications of electromagnetism in devices commonly found in homes and schools.
This document provides an overview of magnetism and magnetic fields. It begins with an introductory activity on magnetism facts. The document then outlines topics to be covered, including magnetic fields, forces on moving charges and currents, and properties of electromagnets and ferromagnets. Examples are provided to demonstrate how to calculate magnetic field strength and forces. The key points are that magnets produce magnetic fields with north and south poles; magnetic fields exert forces on moving charges; and currents generate magnetic fields according to Ampere's law.
This document contains information about electricity and magnetism concepts including:
1. It defines key equations for electric potential, current, resistance, and force due to magnetic fields.
2. It discusses how moving charges experience forces in magnetic fields, and how this relates to phenomena like the aurora borealis and the operation of motors and generators.
3. It introduces concepts like induced currents and how changing magnetic fields can generate electric currents and voltages in conductors according to Lenz's law, which has applications in technologies like electric generators.
The document discusses different types of meters used to measure electric voltage and current, including moving iron, hot wire, and thermocouple meters. It then provides details on the construction and working principles of moving iron meters, which use magnetic forces to deflect a pointer on a scale. The document also covers electromagnetic induction, explaining how a changing magnetic field can induce voltage in a conductor. Key concepts discussed include mutual and self induction, inductive reactance, eddy currents, and the workings of transformers, autotransformers, and dynamos based on electromagnetic induction.
This document provides an overview of basics of electrical engineering, specifically focusing on magnets and magnetism. It defines different types of magnets including permanent magnets, temporary magnets, and electromagnets. It describes magnetic domains, magnetic dipoles, magnetic fields, flux, and various laws of magnetism including Biot-Savart law, Ampere's law, force law, and Faraday's law. It also discusses applications such as solenoids, transformers, and generators.
The document outlines the objectives, outcomes, and units of an Elements of Electrical and Electronics Engineering course. The objectives are to study basic electric circuits, electrical machines, electrical energy applications, and semiconductor devices. The outcomes are to analyze electrical circuits, test electric machines, understand electric power uses, and apply semiconductor principles. The six units cover topics like electrical circuits, DC machines, AC circuits, AC machines, power systems, and electronics devices and digital circuits. Materials for electrical engineering are classified as conductors, semiconductors, insulators, and magnetic materials based on their properties and applications. Circuit elements can be categorized as linear/nonlinear, active/passive, and bilateral/unilateral.
In the intricate tapestry of life, connections serve as the vibrant threads that weave together opportunities, experiences, and growth. Whether in personal or professional spheres, the ability to forge meaningful connections opens doors to a multitude of possibilities, propelling individuals toward success and fulfillment.
Eirini is an HR professional with strong passion for technology and semiconductors industry in particular. She started her career as a software recruiter in 2012, and developed an interest for business development, talent enablement and innovation which later got her setting up the concept of Software Community Management in ASML, and to Developer Relations today. She holds a bachelor degree in Lifelong Learning and an MBA specialised in Strategic Human Resources Management. She is a world citizen, having grown up in Greece, she studied and kickstarted her career in The Netherlands and can currently be found in Santa Clara, CA.
Joyce M Sullivan, Founder & CEO of SocMediaFin, Inc. shares her "Five Questions - The Story of You", "Reflections - What Matters to You?" and "The Three Circle Exercise" to guide those evaluating what their next move may be in their careers.
A Guide to a Winning Interview June 2024Bruce Bennett
This webinar is an in-depth review of the interview process. Preparation is a key element to acing an interview. Learn the best approaches from the initial phone screen to the face-to-face meeting with the hiring manager. You will hear great answers to several standard questions, including the dreaded “Tell Me About Yourself”.
Learnings from Successful Jobs SearchersBruce Bennett
Are you interested to know what actions help in a job search? This webinar is the summary of several individuals who discussed their job search journey for others to follow. You will learn there are common actions that helped them succeed in their quest for gainful employment.
We recently hosted the much-anticipated Community Skill Builders Workshop during our June online meeting. This event was a culmination of six months of listening to your feedback and crafting solutions to better support your PMI journey. Here’s a look back at what happened and the exciting developments that emerged from our collaborative efforts.
A Gathering of Minds
We were thrilled to see a diverse group of attendees, including local certified PMI trainers and both new and experienced members eager to contribute their perspectives. The workshop was structured into three dynamic discussion sessions, each led by our dedicated membership advocates.
Key Takeaways and Future Directions
The insights and feedback gathered from these discussions were invaluable. Here are some of the key takeaways and the steps we are taking to address them:
• Enhanced Resource Accessibility: We are working on a new, user-friendly resource page that will make it easier for members to access training materials and real-world application guides.
• Structured Mentorship Program: Plans are underway to launch a mentorship program that will connect members with experienced professionals for guidance and support.
• Increased Networking Opportunities: Expect to see more frequent and varied networking events, both virtual and in-person, to help you build connections and foster a sense of community.
Moving Forward
We are committed to turning your feedback into actionable solutions that enhance your PMI journey. This workshop was just the beginning. By actively participating and sharing your experiences, you have helped shape the future of our Chapter’s offerings.
Thank you to everyone who attended and contributed to the success of the Community Skill Builders Workshop. Your engagement and enthusiasm are what make our Chapter strong and vibrant. Stay tuned for updates on the new initiatives and opportunities to get involved. Together, we are building a community that supports and empowers each other on our PMI journeys.
Stay connected, stay engaged, and let’s continue to grow together!
About PMI Silver Spring Chapter
We are a branch of the Project Management Institute. We offer a platform for project management professionals in Silver Spring, MD, and the DC/Baltimore metro area. Monthly meetings facilitate networking, knowledge sharing, and professional development. For more, visit pmissc.org.
Leadership Ambassador club Adventist modulekakomaeric00
Aims to equip people who aspire to become leaders with good qualities,and with Christian values and morals as per Biblical teachings.The you who aspire to be leaders should first read and understand what the ambassador module for leadership says about leadership and marry that to what the bible says.Christians sh
2. Learning outcomes
• describe and explain the behaviour of permanent magnets,
including induced magnetism
• explain magnetisation and demagnetisation of ferromagnetic
materials in terms of magnetic domains
• describe how magnetic fields arise from moving charges, e.g.
in current-carrying straight wires, plane coils and solenoids
• describe how a transformer works, in terms of transformer
turns, currents & voltages
• describe the vectors involved in motor and dynamo effects
• explain why electricity is transmitted at high voltage
• experience relevant demonstration & class experiments
3. Overview
• contexts for teaching about electromagnetism
• permanent magnets
• electromagnets
• catapult effect and motors
• electromagnetic induction and generators
• Lenz’s law
• transformers & high voltage transmission of electricity
Circus of experiments
4. Misconceptions
• All metals are magnetic materials.
• Static charges interact with the poles of permanent magnets.
• Magnetic poles are located on the surface of a magnet.
[Careful observation shows that they are inside the magnet.]
5. Teaching challenges
Magnetic fields
• cannot be seen directly
• are three-dimensional, though commonly represented by 2-D
diagrams.
Some students find it hard to understand
• why permanent magnets can lose their strength
• that the geographic North pole must be a south magnetic pole
• that a current-carrying coil of wire induces (temporary)
magnetism in the iron core of an electromagnet.
• the operation of motors and generators (incl left hand rule)
6. A brief history
1600 William Gilbert, On magnetism; magnetic materials;
poles that attract & repel; Earth’s magnetic field, compass ‘dip’
1820 Hans Christian Oersted finds that an electric current deflects
a compass needle.
1820 Andre Marie Ampère finds that parallel wires
carrying current produce forces on each other.
1820s, 1830s Michael Faraday develops the concept of
electric field and shows that
electric current + magnetism -> motion (motor effect)
motion + magnetism -> electric current (electromagnetic induction)
1860s James Clerk Maxwell (1831-1879) establishes
a mathematical description of electromagnetism.
7. Motors everywhere
lifts & escalators; fans, turbines, drills; wheelchairs; car windscreen
wipers, starter motors, windows & side mirrors; motors in electric
cars, locomotives & conveyor belts; industrial robots, saws and
blades in cutting and slicing processes; food mixers & blenders,
microwave ovens; hand power tools such as drills, sanders,
routers; electric toothbrushes, shavers, hairdryers; vacuum
cleaners, sound systems, computers …
using electricity supplied by power station generators
8. Field lines indicate both direction and magnitude
(strength) of a magnetic field. They end at poles.
A compass needle can be thought of as a test dipole.
Magnetic flux density (‘field strength’) has symbol B, unit tesla.
Describing a magnetic field
Bar magnet
9. Common misconceptions
• All metals are magnetic materials.
• Static charges interact with the poles of permanent magnets.
• Magnetic poles are located on the surface of a magnet.
[Careful observation shows that they are inside the magnet.]
10. Magnetic poles: always pairs
A permanent magnet can be split into two or more
magnets, each with N and S poles which cannot be
isolated.
This suggests that the magnetic effect of a permanent
magnet comes from microscopic, circulating electric
currents.
11. Electron spin, inside atoms,
is the main cause of
ferromagnetism.
demagnetised
magnetised
Microscopic structure
Domain theory
12. Magnetising & demagnetising
Make a magnet
• by stroking
• by using DC coil carrying current
• by tapping while aligned with the Earth’s field
Demagnetise a magnet
• by dropping or banging randomly
• by heating
• by applying a diminishing AC current
13. Magnetic induction
A permanent magnet can induce temporary magnetism
in a ‘soft’ magnetic material.
• This causes attraction, but cannot cause repulsion.
• Use repulsion to test if an object is already magnetised.
14. Right hand screw rule, a.k.a. the ‘corkscrew’ or
‘pencil sharpener’ rule:
Place thumb in direction of current; fingers indicate direction of
the magnetic field.
Magnetic field of a straight wire
NB: Here
field lines
are closed
loops.
15. Magnetic field of a solenoid
Right hand grip rule: Wrap fingers around solenoid in
direction of current; thumb indicates N pole.
N S
17. A stronger electromagnet
Length of a solenoid is L
• Use iron or steel core (increasing permeability, )
• Increase the current, I
• Increase wraps or turns of solenoid, N.
I
L
N
B
18. Uses of electromagnetism
• loudspeaker
• moving coil microphone
• motors of various designs
• electric bell or buzzer (can be made in class, URLS below)
• moving coil galvanometer (ammeter)
• relay (control circuit with small current switches a second,
larger, current circuit)
Practical Physics website: model buzzer, model electric bell
23. The ampere defined
1 ampere: the steady current
which, when flowing in two
straight parallel wires of infinite
length and negligible cross-
section, separated by a distance
of one metre in free space,
produces a force between the
wires of
2 × 10-7 newtons per metre of
length
24. Electromagnetic induction
(‘Dynamo effect’)
Faraday’s law: Relative motion of a wire and a magnetic field will induce
an e.m.f. (voltage). If there is a complete circuit, a current will be induced
too.
– magnet stationary, coil moves
– coil stationary, magnet moves,
– coil stationary, magnetic field lines changing
Induced EMF is proportional to ‘the rate at which field lines are cut’.
Lenz’s Law: The induced current always flows in such a direction as to
oppose the change which causes it.
Faraday’s Electromagnetic Lab phet.colorado.edu/en/simulation/faraday
30. power in primary coil = power in secondary coil
Ideal transformer
IpVp = IsVs
Is
Ip
=
Vp
Vs
How a transformer works:
micro.magnet.fsu.edu/electromag/java/transformer/index.html
31.
32. High voltage transmission
Heating loss in a transmission cable:
Keep current small by making voltage large.
Grid voltages: 275 kV, 400 kV
Model power line
www.electrosound.co.uk
R
I
IR
I
IV
P 2
)
(
33. A sustainable energy future
‘… much more energy demand will be met through the electricity
system and generation will be added both centrally and
throughout the distribution system.’
‘Turning [carbon] emissions reduction targets into reality will require
more than political will: it will require nothing short of the biggest
peacetime programme of change ever seen in the UK.’
(Royal Academy of Engineering report, March 2010, Generating the future)
‘Renewable generation, which by its nature will be widely
distributed and mainly located in coastal and northern regions,
will also require considerable investment in electrical supply
system infrastructures both in terms of local distribution systems
and the national grid.’
(Royal Academy of Engineering, July 2006, Energy seminars report)
34. Safety
Hazard with strongest rare earth (neodymium)
magnets – swallow, shatter, pinch, interfere
• keep away from (>1m) any person who uses medical aids like a
pacemaker
• only responsible students or yourself to handle largest ones, or
more than one at a time
• wear safety spectacles and protective gloves when handling two
or more of the largest, most powerful magnets – risk of
shattering or pinching
• keep away from (>1m) electronic devices like computer
monitors, credit cards and memory sticks
35. Electromagnetism: a summary
• The force, F, acting on charge q
has two components:
E, electric field due to stationary charge(s).
B, magnetic field due to moving charge(s) - currents - with
relative velocity v.
• can be superposed e.g. E = E1 + E2 + …
• electric & magnetic fields store energy
• Maxwell’s equations: laws that describe the structure of the
electromagnetic field. E and B fields can exist without a circuit
and test magnetic dipole.
B
v
E
q
F
36. J. Clerk Maxwell (1865), ‘A Dynamical Theory of the Electromagnetic
Field’ Phil. Trans. R. Soc. Lond.
A changing electric field induces a changing magnetic field, and
vice versa. It therefore makes sense to talk of an
‘electromagnetic field’.
Electromagnetic waves propagate in
free space at c = 3 x 108 m/s.
E and B are always perpendicular to each other, and
perpendicular to the direction of propagation.
Electromagnetic waves
37. Em fields are real
‘The electromagnetic field is, for the
modern physicist, as real as the chair
on which he sits.’
Einstein and Infeld, 1938
38. Support, references
talkphysics.org
SPT 11-14 Electricity & magnetism
David Sang (ed., 2011) Teaching secondary physics ASE / Hodder
Practical Physics website: Electromagnetism topic
http://www.nuffieldfoundation.org/practical-physics/electromagnetism
PhET simulation Faraday’s Electromagnetic Lab