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Edexcel IGCSE Physics

Topic questions Electricity Mains electricity

Mains electricity

5 questions · 42 marks · about 45 minutes

Mains electricity questions

TopicMains electricity

Edexcel 4PH1 Mains electricity 5 questions

Physics Paper 1 November 2024, Question 3 7 marks

(a)

Photograph 1 shows a power supply for some electrical equipment. The electrical equipment is connected to the mains supply.

Figure for question 3

Explain why the power supply is completely covered in plastic.

[2]
(b)

The electrical equipment is connected to the mains power supply of 230 V.

(b)(i)

State the formula linking power, current and voltage.

[1]
Reveal mark scheme Mark scheme for question 3(b)(i)
(b)(ii)

The electrical equipment has a power of 350 W.

Calculate the current in the equipment when it is being used.

[2]
Reveal mark scheme Mark scheme for question 3(b)(ii)
(c)

Photograph 2 shows a circuit breaker.

Figure for question 3

Explain the advantages of using a circuit breaker rather than a fuse.

[2]
Reveal mark scheme Mark scheme for question 3(c)

Physics Paper 1 June 2024 (R), Question 2 6 marks

The photograph shows an electric heater connected to the mains electricity supply.

Figure for question 2

(Source: © Yevhen Prozhyrko / Shutterstock)

The circuit the heater is connected to is fitted with a circuit breaker, which breaks the circuit if the current gets too high.

(a)

Give an advantage of using a circuit breaker instead of using a fuse.

[1]
Reveal mark scheme Mark scheme for question 2(a)
(b)

The voltage of the mains electricity supply is 230 V.

(b)(i)

State the formula linking power, current and voltage.

[1]
Reveal mark scheme Mark scheme for question 2(b)(i)
(b)(ii)

The normal operating current of the heater is 11 A.

Calculate the input power to the heater for this current.

Give your answer in kW.

[3]
Reveal mark scheme Mark scheme for question 2(b)(ii)
(c)

The circuit breaker has a rating of 16 A.

Suggest a reason why the heater may switch off before it reaches its normal operating current.

[1]
Reveal mark scheme Mark scheme for question 2(c)

Physics Paper 1 June 2023, Question 3 8 marks

A family has a television set.

(a)

The television set has a low power mode called standby.

When on standby, the power rating of the television set is 0.27 W.

Calculate the energy transferred to the television set on standby in 12 hours.

[3]
Reveal mark scheme Mark scheme for question 3(a)
(b)

In normal use, the current in the television set is 0.31 A.

(b)(i)

Explain how a fuse works to protect the television set if there is a fault.

[3]
Reveal mark scheme Mark scheme for question 3(b)(i)
(b)(ii)

Explain why a 13 A fuse is not an appropriate choice of fuse to use in the plug of this television set.

[2]
Reveal mark scheme Mark scheme for question 3(b)(ii)

Physics Paper 1 June 2022, Question 7 8 marks

Also involves Standard circuit diagram symbols

(a)

State what is meant by the term electric current.

[1]
Reveal mark scheme Mark scheme for question 7(a)
(b)

Diagram 1 shows an electric circuit used to test a fuse.

Figure for question 7
(b)(i)

Give a reason why an LED is included in the circuit.

[1]
Reveal mark scheme Mark scheme for question 7(b)(i)
(b)(ii)

Add another component to the circuit in diagram 1 to measure the current in the fuse.

[1]
Reveal mark scheme Mark scheme for question 7(b)(ii)
(c)

Diagram 2 shows a different electric circuit containing three different lamps.

Figure for question 7
(c)(i)

Calculate the current I1.

[1]
(c)(ii)

State the current I2.1

[1]
(c)(iii)

Explain which lamp is the brightest.2

[3]
Reveal mark scheme Mark scheme for question 7(c)(iii)

Physics Paper 1 January 2021, Question 4 13 marks

The photograph shows a hair dryer plugged into the mains supply.

The hair dryer contains a fuse.

Figure for question 4
(a)

State which wire in the hair dryer should be in series with the fuse.

[1]
Reveal mark scheme Mark scheme for question 4(a)
(b)

The fuse is an electrical safety feature used in mains-operated domestic appliances.

State two other electrical safety features that can be used in mains-operated domestic appliances.

[2]
Reveal mark scheme Mark scheme for question 4(b)
(c)

The hair dryer has a current of 9.6 A.

The mains supply voltage is 230 V.

(c)(i)

State the formula linking power, current and voltage.

[1]
Reveal mark scheme Mark scheme for question 4(c)(i)
(c)(ii)

Calculate the power of the hair dryer.

Give the unit.

[3]
Reveal mark scheme Mark scheme for question 4(c)(ii)
(c)(iii)

The hair dryer contains a coil of wire which is used to heat air passing through the hair dryer.

Explain why the coil of wire heats up when there is a current in it.

[3]
Reveal mark scheme Mark scheme for question 4(c)(iii)
(d)

Explain how a fuse protects a domestic appliance.

[3]
Reveal mark scheme Mark scheme for question 4(d)

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