(a(i))[1]
Define what resistance is.
(a(ii))[2]
A potential difference of $0.60\,\text{V}$ is applied across a resistor with resistance $4.0\,\text{G}\Omega$. Calculate the current, in pA, in the resistor.
(b)[3]
The energy $E$ transferred when charge $Q$ passes through an electrical component is given by $E = QV$, where $V$ is the potential difference across the component. Use the equation to determine the SI base units of potential difference.