2023 · O/N · 5054/22 | Q7

0/40parts marked · 0 of 80 marks

Question (7 of 10)7 marks · Practise this topic →

Options

Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.

(a)

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A circuit has a battery, fixed resistor R, voltmeter and thermistor. Complete Fig. 7.1 by drawing a thermistor symbol between terminals T₁ and T₂.

A circuit has a battery, fixed resistor R, voltmeter and thermistor.

Complete Fig. 7.1 by drawing a thermistor symbol between terminals T₁ and T₂.

Answer guidance

Complete Fill in every gap. A partly completed answer usually scores partly.

[1 mark]

(b)(i)

Using Fig. 7.1, calculate the current in R when its resistance is 2.5 Ω and the voltmeter reads 0.40 V.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[2 marks]

(b)(ii)

Using Fig. 7.1, calculate the power transferred in R when its resistance is 2.5 Ω and the voltmeter reads 0.40 V.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[2 marks]

(c)

The thermistor temperature increases. Explain what happens to the voltmeter reading in Fig. 7.1.

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[2 marks]

5054/22/O/N/23Cambridge O Level Physics 5054 · Oct/Nov 2023 · Paper 2 variant 2 · Question 7