(a)[1]
Describe the distinction between a direct current (d.c.) and an alternating current (a.c.).
(b(i))[1]
On Fig. 9.2, draw a graph to show how the current in the heater changes with time.
(b(ii))[2]
Calculate the power output of the heater when the current is $0.75\text{ A}$.
(c(i))[1]
On Fig. 9.3, draw a straight arrow to show the direction in which side AB of the coil is moving. Give this arrow the label M.
(c(ii))[2]
Deduce the direction of the current induced in side AB of the coil and give your reasoning.
(c(iii))[2]
State two changes that the alternating voltage undergoes.