(a)[2]
Explain the meaning of electromotive force (e.m.f.).
(b(i))[1]
Calculate the current through heating element R$_1$.
(b(ii))[2]
Calculate the power output of heating element R$_1$.
(b(iii).1)[2]
State and explain how the current in R$_2$ relates to the current in R$_1$.
(b(iii).2)[2]
Suggest and explain an appropriate fuse rating for this circuit.