A transformer and a diode are employed to charge a battery. Fig. 8.1 illustrates the transformer, which has a soft-iron core and two coils. The primary coil is joined to the 240 V a.c. mains supply. The secondary coil is connected in series with the diode and the battery.
(a)[2]
Explain why an electromotive force (e.m.f.) is generated in the secondary coil.
(b)[1]
The e.m.f. induced in the secondary coil is less than 240 V. Suggest a reason why.
(c)[1]
Suggest why steel is unsuitable for use as a transformer core.
(d)[1]
Describe what the diode does.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “a.c. in primary coil produces magnetic field” …