In each of the circuits below, a short circuit occurs. In which circuit would the fuse blow and make the circuit safe to repair?

5054_s05_qp_1

MCQ

2005

Paper 1, Variant 0

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Three identical heating elements are wired up to the mains supply in the three arrangements shown...

5054_s08_qp_1

MCQ

2008

Paper 1, Variant 0

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In each of the circuits below there is a short circuit. In which circuit does the fuse blow and make the circuit safe to repair?

5054_s08_qp_1

MCQ

2008

Paper 1, Variant 0

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A student has a chain of 20 lamps. These are wired in series and connected to the mains. One lamp blows and all the others go out. The student wants to find the faulty lamp and replace it. Where should the student begin?

5054_s09_qp_1

MCQ

2009

Paper 1, Variant 0

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A plug is wrongly wired as shown...

5054_s09_qp_1

MCQ

2009

Paper 1, Variant 0

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The metal case of an electric heater is earthed. The plug to the heater contains a 5 A fuse. There is a current of 4 A when the heater works normally. The cable to the heater becomes so worn that the live wire makes electrical contact with the case. What happens?

5054_s10_qp_11

MCQ

2010

Paper 1, Variant 1

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The metal case of an electric heater is earthed. The plug to the heater contains a 5 A fuse. There is a current of 4 A when the heater works normally. The cable to the heater becomes so worn that the live wire makes electrical contact with the case. What happens?

5054_s10_qp_12

MCQ

2010

Paper 1, Variant 2

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What causes the fuse to blow in a mains electrical circuit?

5054_s12_qp_11

MCQ

2012

Paper 1, Variant 1

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Five electrical appliances are connected to the same socket and there is a very large current. Why is this dangerous?

5054_s13_qp_12

MCQ

2013

Paper 1, Variant 2

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An electric hairdryer and an electric heater are connected to the mains supply, as shown in . The cable from the heater to the mains supply has a live, a neutral and an earth wire. State the purpose of the neutral wire. The live wire in the electric heater touches the outer metal case. Explain how the earth and the fuse together protect the user from electric shock. The hairdryer does not have an earth wire. Explain why this hairdryer is still safe to use. In some modern homes, circuit breakers are used instead of fuses. Suggest one advantage of using a circuit breaker rather than a fuse.

5054_s15_qp_22

THEORY

2015

Paper 2, Variant 2

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