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Physics revision
Types of energy
1. Magnetic
Energy in magnets and electromagnets
2. Kinetic
The energy in moving objects.
3. Heat/Thermal
4. Light
5. Gravitational potential
Stored energy in raised objects.
6. Chemical
Stored energy in fuel, foods and batteries
7. Sound
Energy released by vibrating objects
8. Electrical
Energy…

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Cost of electricity = Cost per KWh x Total amount of used KWh

Reflection
Reflection occurs when light bounces off objects. How much reflection
depends upon how even the surface is. If the surface is rough, the light
scatters. If the surface is smooth and flat, the light will bounce…

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Convection occurs when particles with a
lot of heat energy in a liquid or gas move
and take the place of particles with
less heat energy.
As a result, the particles take up more
volume. The liquid or gas in hot areas is
less dense than the liquid or gas…

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Calculate energy required to heat a 500 g mass of lead from 20°C to 46°C (SHC of lead = 140J/KG/°C)?

E = MC

E = 0.5 x 140 x 26 = 1820

E = 1820J

E = 1.82 KJ

Payback Times
It is the time it takes to recoup in…

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This is how a power station works



Disadvantages of using fossil fuels


Fossil fuels are non-renewable energy resources: their supply is
limited and they will eventually run out. Fossil fuels do not
renew themselves, while fuels such as wood can be renewed
endlessly.
Coal and oil release sulphur dioxide gas…

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Water energy
Wave
The water in the sea rises and falls because of waves on the surface. Wave machines use the kinetic
energy in this movement to drive electricity generators.
Tides
A tidal barrage is a barrier built over a river estuary to make use of the kinetic energy in…

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Solar cells are devices that convert light energy directly into
electrical energy.
Advantages
Solar energy is a renewable energy resource and there are
no fuel costs. No harmful polluting gases are produced. Solar cells
provide electricity in remote locations, such as roadside signs.
Disadvantages
Solar cells are expensive and inefficient,…

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