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Home > Science > AQA Science Topics > Energy and efficiency > Electrical appliances

Science

Energy and efficiency

Electrical appliances - Test

1.

The energy transferred by an electrical appliance can be calculated using this equation:

energy = power × time

How much energy is transferred by a 500 W electric drill in 30 seconds?

2.

A 250W computer is switched on for 4 hours. How many Units of electricity does it use?

3.

A 2 kW electric fire is switched on for 30 minutes. How many Units of electricity does it use?

4.

If one Unit of electricity costs 10p, how much will 30 Units cost?