Fig. 8.1 is a labelled diagram of one section of a simple a.c. generator. The labels show a magnet, a coil of wire, an axle, an external circuit, and component C (soft iron core). Contacts A and B are also shown.
(a(i))[2]
Identify the parts labelled A and B in Fig. 8.1.
(a(ii))[1]
Describe how this component affects the generator.
(b)[3]
Sketch a graph of the generated e.m.f. against time on the axes in Fig. 8.2.
(c(i))[2]
Explain why transmitting electricity at high voltages is advantageous.
(c(ii))[2]
Calculate the number of turns $N_s$ on the transformer's secondary coil.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A: carbon brushes” …