Ähnlich wie Outcome 2.1 & 2.2 identify and use internationally recognised (si) units of measurement for general and specifically to electrical variables
Ähnlich wie Outcome 2.1 & 2.2 identify and use internationally recognised (si) units of measurement for general and specifically to electrical variables (20)
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Outcome 2.1 & 2.2 identify and use internationally recognised (si) units of measurement for general and specifically to electrical variables
1.
08/2 – Understand standard units of
measurement used in electrical
installation, maintenance and design
work.
Outcome 2.1/2.2 – Standard form (SI)
and formula transposition
Unit 08 Principles of electrical science
3. 2.1 - Identify and use internationally recognised (SI)
units of measurement for general variables.
2.2 - Identify and determine values of basic SI units
which apply specifically to electrical variables.
Current, potential, resistance, resistivity, temperature,
force, magnetic flux, magnetic flux density, period,
frequency, power, energy, time, length, area, mass,
weight.
1.1 - Transpose basic formulae. (reminder)
This session
15.
magnetic flux, magnetic flux density and
area
Magnetic flux is how strong a magnet is.
Magnetic flux is given the symbol Φ and is
measured in units called Webers (Wb).
16.
magnetic flux, magnetic flux density and
area
Magnetic flux density is how much
magnetism there is in an area
Magnetic flux density is given the symbol B
and is measured in units called Telsas (T).
17.
magnetic flux, magnetic flux density and
area
Formula
Flux (Φ) = Flux density (B) x area (A)
Φ = BA
Transpose
18.
Mass and weight
What is the difference between mass and weight?
Mass = 80 kg Mass = 80 kg
Weight = 0 Weight = 80 × gravity
21.
Mass and weight
Earth Moon Mercury Venus Mars Pluto
Surface Gravity
(compared to Earth)
1 0.17 0.38 0.90 0.38 0.06
How much
you can lift
10 kg 60 kg 30 kg 10 kg 30 kg 170 kg
How high
you can jump
20
cm
120 cm 53 cm 22 cm 53 cm 340 cm
How long it takes to fall
back to the ground
0.4 s 2.4 s 1.1 s 0.4 s 1.1 s 6.8 s
How far you
can kick a ball
20 m 120 m 53 m 22m 53 m 340 m
22.
Force
Measured in Newtons (N)
Distance
Measured in metres (M)
Energy
Same as work done measured in Joules(J)
symbol W
Force, distance and energy
24.
2.1 - Identify and use internationally recognised (SI) units
of measurement for general variables.
2.2 - Identify and determine values of basic SI units which
apply specifically to electrical variables.
Current, potential, resistance, resistivity, temperature, force,
magnetic flux, magnetic flux density, period, frequency,
power, energy, time, length, area, mass, weight.
1.1 - Transpose basic formulae. (reminder)
Consolidation
Speaker notes
Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass.
Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight.
All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N).
Ask: What is gravity as a figure? (We generally use 9.81 m/s2.)
Ask: How much do you actually weigh? (Learners’ weight (if willing to say))
Speaker notes
Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass.
Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight.
All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N).
Ask: What is gravity as a figure? (We generally use 9.81 m/s2.)
Ask: How much do you actually weigh? (Learners’ weight (if willing to say))
Speaker notes
Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass.
Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight.
All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N).
Ask: What is gravity as a figure? (We generally use 9.81 m/s2.)
Ask: How much do you actually weigh? (Learners’ weight (if willing to say))
Speaker notes
Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass.
Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight.
All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N).
Ask: What is gravity as a figure? (We generally use 9.81 m/s2.)
Ask: How much do you actually weigh? (Learners’ weight (if willing to say))
