On Fig. 6.1, add the positive $(+)$ label for the load resistor $R$.
State which diodes are conducting when terminal $Y$ of the supply is positive. diode ................. and diode .................
Fig. 6.2 shows how the potential difference $V$ across the load resistor $R$ varies with time $t$.
Use Fig. 6.2 to calculate the mean power dissipated in resistor $R$. The load resistor $R$ has resistance $2700\,\Omega$.
On Fig. 6.1, draw the symbol for a capacitor so that it is connected to increase the mean power dissipated in the resistor $R$.
The capacitor from b(ii) is now taken out of the circuit. Diode A in Fig. 6.1 no longer works, so its resistance is infinite. On Fig. 6.2, sketch how the potential difference across resistor $R$ now varies with time $t$.
Use Fig. 6.2 to calculate the mean power dissipated in resistor $R$.
On Fig. 6.1, draw the symbol for a capacitor so that the mean power dissipated in the resistor $R$ increases.