2023 · Specimen · 5054/02 | Q6

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Question (6 of 10)6 marks · Practise this topic →

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You may use a calculator. You should show all your working and use appropriate units. Take the weight of 1.0 kg to be 9.8 N (acceleration of free fall = 9.8 m/s²).

(a)(i)

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Fig. 6.1 shows a 4.5 V battery connected to an ammeter and a parallel combination of a light-dependent resistor (LDR) and a resistor of resistance 1800 Ω. The resistance of the LDR is 9000 Ω. Calculate the combined resistance of the LDR and the 1800 Ω resistor.

A 4.5 V battery is connected in a circuit with an ammeter, a light-dependent resistor (LDR) and a 1800 Ω fixed resistor.

Fig. 6.1 is the circuit diagram.

Fig. 6.1: a 4.5 V battery and ammeter connected to a parallel LDR and 1800 Ω resistor.

The light incident on the LDR causes its resistance to be 9000 Ω.

Calculate the total resistance of the circuit.

resistance = ...................................... Ω

Answer guidance

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

[2 marks]

(a)(ii)

Calculate the reading on the ammeter.

reading = ...................................... A

Answer guidance

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

[2 marks]

(b)(i)

A very bright lamp is switched on and the intensity of the light incident on the LDR increases.

State and explain what happens to the current in the LDR.

what happens to the current ......................................

explanation ......................................

Answer guidance

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

[1 mark]

(b)(ii)

State and explain what happens to the current in the 1800 Ω resistor.

what happens to the current ......................................

explanation ......................................

Answer guidance

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

[1 mark]

5054/02/SP/23Cambridge O Level Physics 5054 · Specimen 2023 · Paper 2 · Question 6