(a)[2]
Use an expression for work done in terms of force to show that the SI base units of energy are $\text{kg m}^2\text{s}^{-2}$.
(b(i))[2]
The energy $E$ stored in an electrical component is given by $E = \frac{Q^2}{2C}$, where $Q$ is charge and $C$ is a constant. Use this equation together with the information from part (a) to determine the SI base units of $C$.
(b(ii)-1)[1]
Readings of a constant current in a wire are made with an analogue ammeter. For these readings, describe one possible cause of: a random error.
(b(ii)-2)[1]
Readings of a constant current in a wire are made with an analogue ammeter. For these readings, describe one possible cause of: a systematic error.