Edexcel GCSE Combined Science CP3 and CP8 Energy overview quiz quiz

Energy can be freely created out of nothing but it can never be destroyed at all

Energy is always completely lost during any reaction

Energy cannot be created or destroyed, only transferred or stored

Energy can be destroyed by the action of friction

mgh

force times distance

mass times gravity

half m v squared

18 J

12 J

36 J

6 J

half m v squared

m g h

force times distance

energy over time

Work = mass times acceleration

Work = energy over time

Work = force times distance

Work = voltage times current

The total amount of energy that is stored altogether

The size of the force that is applied to the object

The total distance that the object is moved

The rate of transferring energy (energy per second)

30 W

300 W

27000 W

3 W

The total energy input divided by the useful energy output

Useful energy output divided by total energy input

The total energy multiplied by the time taken

The force applied multiplied by the distance moved

35%

150%

70%

85%

Some of the energy supplied is always completely destroyed inside the device

All real devices are simply made too badly to ever work properly

Energy cannot be transferred from one store to another at all

Some energy is always dissipated to the surroundings, usually as heat

Coal

Wind

Solar

Hydroelectric

It is completely destroyed and disappears from existence for good

It spreads out to the surroundings and becomes less useful

It is stored away permanently inside the device

It is turned directly into extra mass