Fig. 6.1 shows a circuit made up of a battery with electromotive force (e.m.f.) $4.5\,\text{V}$, a $28\,\Omega$ resistor, and a variable resistor.
(a)[1]
The battery is formed from three identical cells in series. Determine the e.m.f. of each cell.
(b(i))[2]
The potential difference (p.d.) across the variable resistor is $2.5\,\text{V}$. State what is meant by potential difference.
(b(ii))[3]
Calculate the resistance in the variable resistor.
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