Available practice: 76 of 80 marks. Parts 10(c) await marking support. Scores cover available parts only. Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.
Fig. 8.1 shows a step-down transformer used to operate an electric bell.
(a)State the material used for the transformer core.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[1 mark]
(b)An electric current in the primary coil produces a magnetic field in the core. Explain how an alternating voltage arises in the secondary coil.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[3 marks]
(c)The primary has 4600 turns and takes 230 V mains. The bell needs 5.0 V. Calculate the number of turns required on the secondary.
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]
(d)State one change that would make the Fig. 8.1 transformer a step-up transformer.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[1 mark]
5054/22/M/J/23Cambridge O Level Physics 5054 · May/June 2023 · Paper 2 variant 2 · Question 8