State two uses of capacitors in electrical circuits.
Find the total capacitance of the arrangement shown in Fig. 5.1.
Find the maximum potential difference that may be applied safely between points A and B.
Three capacitors, each labelled $30\,\mu\text{F}$ and with a maximum of $6\,\text{V}$, are connected as shown in Fig. 5.1. Determine, for the arrangement shown in Fig. 5.1, (i) the total capacitance, and (ii) the maximum potential difference that can be applied safely between points A and B.
A capacitor with capacitance $4700\,\mu\text{F}$ is charged to a potential difference of $18\,\text{V}$. It is then partly discharged through a resistor, reducing the potential difference to $12\,\text{V}$. Calculate the energy dissipated in the resistor during the discharge.