Gradegorilla GCSE PHYSICS -

OCR GCSE

Energy

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1.The power supplied to a lightbulb is written as 60W. The 'W' stands for

2. A 60 W light bulb is switched on for 20 s. Using the formula for energy on the right, The energy used is

energy = power x time

3. If 1 kilowatt hour (kWh) costs 10 p, how much would it cost to run a 2kW heater for 4 hours?

4. Look at the electricity meter readings below taken 1 month apart:

2	3	6	9		2	4	0	1
March 1st					April 1st

If each unit costs 5p, how much will this customer be charged for this month?

5. Mains electricity from a 3 pin plug in a home has a voltage of

6. A mains electricity hair dryer uses 2 A when on full power. The power used is

power =current x voltage

A small village by the sea is considering alternative energy resources to give power to all the homes.

They are discussing wind turbines, a small hydroelectric plant, solar panels and wave power.

Which of these 4 sources...

7. would be the most reliable, providing electricity consistently?

8. would have a higher output in summer?

9. would have an environmental impact on the village river?

10-15. This paragraph is about a coal fired power station. What are the missing words?

In a coal fired power station, the coal is burned and used to heat .

This produces steam which turns a .

This then turns a , which produces electricity.

Instead of coal, the heat can be generated using any .

The generator produces electricity by spinning a near to a coil of wire.

If a higher energy output is needed, more is used by the power station.

16. A non-renewable energy source is one that

17. Which one of the following energy resources is renewable?