(a)[1]
Define potential difference (p.d.) in words.
(b(i))[3]
Show that each wire has a resistance of $0.54\,\Omega$.
(b(ii))[3]
Calculate the current flowing in the wires.
(b(iii))[3]
Calculate the power loss in the wires.
(c)[2]
The wires that supply the heater are changed for wires of the same length and material, but with a cross-sectional area of $0.50\,\text{mm}^2$. Without doing any more calculation, state and explain how this affects the power loss in the wires.