(a(i))[1]
State what the iron core does.
(a(ii))[2]
Explain the reason the iron core is laminated.
(b(i))[1]
The input p.d. $V_{\text{IN}}$ is a sinusoidal alternating voltage with peak value $12\,\text{kV}$ and period $40\,\text{ms}$. Calculate the greatest value of $V_{\text{OUT}}$.
(b(ii))[1]
Calculate the root-mean-square (r.m.s.) current through the load resistor.
(b(iii))[3]
On Fig. 10.2, sketch how the power $P$ dissipated in the load resistor varies with time $t$ from $t = 0$ to $t = 40\,\text{ms}$. Take $P = 0$ when $t = 0$.
(c)[2]
Explain, using Fig. 10.2, why the mean power in the load resistor is $70\,\text{W}$.
(a(iii))[3]
On Fig. 10.2, sketch how the power $P$ dissipated in the load resistor varies with time $t$ for $t = 0$ to $t = 40\,\text{ms}$. Assume $P = 0$ at $t = 0$.