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year four

GCSE Physics - Electricity & Magnetism

Mains Electricity

Tier: I
17 marks over 12 questions.
You may not use anything other than a calculator for this test.
1 a) In plugs there are usually three wires: blue, brown and green/yellow.

Select the correct property of each wire.

The blue wire carries:		 [1]



b) The brown wire carries: [1]



c) The green/yellow wire carries: [1]



2 Give three hazzards of electricity. [3]
3 What could a combination of earthing and fuses prevent? [2]
4 A __________ in a resistor causes the electrical transfer of energy and an increase in temperature. [1]



5 What is the relationship between power, current and voltage? [1]



6 a) Jamahey has just invented a new time machine. He says that the time machine works at an interestingly high voltage rating of 900 volts, and a power rating of 9.9 kilowatts.

Calculate the current used by the time machine.		 [2]
b) What fuse should Jamahey use for his time machine? [1]



c) Jamahey's time machine take 20 seconds to warm up.

How much energy is transfered by Jamahey's time machine when warming up?		 [2]
7 Mains electricity is... [1]


8 Cells produce ______ electricity. [1]


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