(a)
Determine expressions, in terms of $I_0$ and $R$, for the power $P$ dissipated in the resistor at the times when:
(a(i))[1]
the current is directed in the negative direction.
(a(ii))[1]
the current is directed in the positive direction.
(b)[3]
On Fig. 7.3, sketch the variation of $P$ with $t$ between $t = 0$ and $t = 2.0T$. Add an appropriate scale to the power axis.
(c(i))[1]
Use your answer in (b) to determine, in terms of $I_0$ and $R$, the mean power $\langle P \rangle$ dissipated in the resistor.
(c(ii))[2]
Use your answer in (b) to determine, in terms of $I_0$ and $R$, the root-mean-square (r.m.s.) current $I_{\text{r.m.s.}}$ in the resistor.