1. Agenda Bell work
• Magnet activity
• Pick up and complete
• Notes: Electricity and
Crossword Puzzle
Magnetism
• Electromagnetic Induction
• Circuits and Power Quiz
tomorrow
• Outline Chp. 14 pg 235-245
• Review Questions 1-17

2. Electric Currents,
Magnetic Fields
May 7, 2012

3. Objectives
1. Describe the magnetic field produced by a
current-carrying wire
2. Give examples of how the field can be
made stronger

4. We KNOW
 Electric wire can be made to have a current
 Magnet has a magnetic field surrounding it

5. Interaction
 An electric current produces a magnetic field
 Magnetic field makes up a pattern of circles

6.  When the current is reversed the direction of the
magnetic field is also reversed
 If a current carrying wire is looped the magnetic
field is intensified
 More loops means greater magnetic field

7. Electromagnets
 If a piece of iron is placed in a current-
carrying coil of wire, the iron will become a
magnet – electromagnet (temporary magnet)
 Roller coasters
 Junk yards
 Electric trains

8. Magnetic Forces on Wires
 If an electric current can produce a magnetic
field
 Then, we can use a magnetic field to change
an electric current
 We can use the combination of both to create
a motor