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Home > Science > AQA Science Topics > Energy and efficiency > Heat transfer and efficiency

Science

Energy and efficiency

Heat transfer and efficiency - Test

1.

The useful energy transfer that happens in an electric lamp is:

2.

'Wasted energy' becomes less useful because:

3.

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

4.

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

5.

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