1. P1H Smart Lesson 5

2. Gravitational potential
The 9 types of energy
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Type
3 example sources
Type
3 example sources
Heat
Kinetic (movement)
Nuclear
Sound
Light
Chemical
Electrical
Gravitational potential
Elastic potential

3. The Laws of Physics Write Down
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There are many laws of physics, but one of the most important ones is:
Write Down
Energy cannot be created or destroyed, it can only be converted from one form to another

4. Electricity Light + heat
Energy changes
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Write Down
1) Write down the starting energy:
3) Write down what energy types are given out:
2) Draw an arrow
Electricity Light + heat
4) The Light is a Useful Energy Transfer.
5) The Heat is Wasted because here it is not a Useful Energy Transfer.

5. Efficiency
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Efficiency is a measure of how much USEFUL energy you get out of an object from the energy you put INTO it.
For example, consider a TV:
Light (80J)
Electrical
Energy (200J)
Sound (40J)
Heat (?)
Write Down
Efficiency = Useful energy out
Energy in
x100%

11. Write Down
Induction means making an electrical current.
 Induction of an electric current needs three parts:
An electrical wire or circuit.
A magnet to produce a magnetic field.
MOVEMENT of the wire or magnet to changing the strength of the magnetic field.
The most common use of electromagnetic induction is in the electric generator to produce Alternating Voltages (known as A.C.).

12. Electromagnetic Induction
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The direction of the induced current is reversed if…
The wire is moved in the opposite direction
The field is reversed
The size of the induced current can be increased by:
Increasing the speed of movement
Increasing the magnet strength

13. Electromagnetic induction
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Electromagnetic induction
The direction of the induced current is reversed if…
The magnet is moved in the opposite direction
The other pole is inserted first
The size of the induced current can be increased by:
Increasing the speed of movement
Increasing the magnet strength
Increasing the number of turns on the coil

18. Words – reflect, infra-red, waves, most, power
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Write Down
Radiation
Radiation is when heat moves around in electromagnetic _________ like light does. Any hot object will emit heat radiation – the hotter it is, the more radiation it emits. This type of radiation is called __________. Dark, matt colours will absorb AND emit the _____ infra-red radiation, and light, shiny colours will ________ it.
For a body to stay at constant temperature it must radiate the same average ______ that it absorbs.
Words – reflect, infra-red, waves, most, power