Physics revision P1.1 + P1.2 energy and efficiency

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  • Created by: melisa
  • Created on: 18-09-13 22:40
The useful energy transfer that happens in an electric lamp is:
The correct answer is electricity → light.
1 of 5
'Wasted energy' becomes less useful because:
It becomes increasingly spread out.
2 of 5
Which equation can be used to calculate the efficiency of an energy transfer?
efficiency = useful energy out ÷ total energy in
3 of 5
In a certain device, 25% of the energy is usefully transferred. The energy efficiency of this device is:
25%
4 of 5
A coal-fired power station is 40% efficient. This means that:
40% of the chemical energy stored in coal is transferred to electrical energy.
5 of 5

Other cards in this set

Card 2

Front

'Wasted energy' becomes less useful because:

Back

It becomes increasingly spread out.

Card 3

Front

Which equation can be used to calculate the efficiency of an energy transfer?

Back

Preview of the front of card 3

Card 4

Front

In a certain device, 25% of the energy is usefully transferred. The energy efficiency of this device is:

Back

Preview of the front of card 4

Card 5

Front

A coal-fired power station is 40% efficient. This means that:

Back

Preview of the front of card 5

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