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0625/03/SP/23 · question 2 of 3 in this topic

Question 10

10(a)1 mark

Fig. 10.1 shows a simplified circuit diagram for an electric oven. The oven contains a fan driven by a motor.

On Fig. 10.1, circle the symbol representing the heater.

Fig. 10.1 — see the question text for what it shows

Your answer

Suggested time: 2 min

10(b)2 marks

Fig. 10.1 shows a simplified circuit diagram for an electric oven containing a lamp, a heating element in series with a variable resistor, and a fan motor, all in parallel across the power supply. Fig. 10.1 includes a variable resistor.

Explain the function of the variable resistor in this circuit.

Fig. 10.1 — see the question text for what it shows

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

Your answer

Suggested time: 3 min

10(c)3 marks

An electric oven contains a fan driven by a motor. The potential difference across the motor is 250 V. The current in the motor is 2.0 A.

Calculate the resistance of the motor.

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

Your answer

Suggested time: 5 min

0625/03/SP/23Cambridge IGCSE Physics 0625 · Specimen 2023 · Paper 3 · sit the whole paper