2025 · M/J · 5054/22 | Q6

0/46parts marked · 0 of 80 marks

Question (6 of 9)8 marks · Practise this topic →

Options

Theory: answer all nine questions. Show working and units. For drawings or plotted graphs, upload a clear photo of your sketch on the supplied figure.

Fig. 6.1 shows part of a mains circuit that includes three lamps and a heater.

The mains voltage is 230 V, and the power of the heater is 2000 W.

There is a 5 A fuse in the lighting circuit. Four fuses of different ratings are available for use in the heating circuit as shown in the list.

Underline the most suitable fuse value for the heating circuit fuse, and explain your choice.

Your answer must include a calculation.

available fuses: 5 A 8 A 13 A 30 A

(a)calculation

Fig. 6.1 — see the question text for what it shows

Answer guidance

Draw Accuracy is being marked. Use the figure and be precise about position and labels.

[3 marks]

(b)Describe what happens to a fuse when the current is too large.

Answer guidance

Describe Say what happens, in order. Reasons are not required unless the question also asks why.

[1 mark]

Table 6.1 shows the current in lamps of type P and type Q when connected to the mains supply.

(c)(i)Calculate the current in the lighting circuit fuse when all three lamps are switched on.

Table 6.1 — see the question text for what it shows

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[1 mark]

The rating for the lighting circuit fuse in Fig. 6.1 is 5 A.

The lamp of type Q is removed from the circuit.

(c)(ii)Calculate the maximum number of additional lamps of type P that can now be connected in parallel to the lighting circuit.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[1 mark]

In some houses the lighting circuit is protected by a trip switch (circuit breaker) instead of a fuse.

(d)State two advantages of using a trip switch rather than a fuse.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[2 marks]

5054/22/M/J/25Cambridge O Level Physics 5054 · May/June 2025 · Paper 2 variant 2 · Question 6