Find the work done (in J) when a charge of 10 C moves across a potential difference of 2 V.

The relationship between work done ($W$), electric charge ($Q$), and potential difference ($V$) is given by the formula:
$$W=Q\times V$$
Given parameters:Charge, $Q=10\text{C}$ Potential difference, $V=2\text{V}$ Substituting the values into the formula:
$$W=10\times 2=20\text{J}$$