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