(a(i))[1]
The student measures the potential difference (p.d.) across the wire XY. On Fig. 10.1, place the voltmeter in the correct position. Use the correct symbol.
(a(ii))[1]
A current flows through the wire. State the name of the particles that move through the wire.
(a(iii))[2]
State one difference between the current in wire CD and the current in wire XY. Explain your answer.
(a(iv))[1]
State the unit for the electromotive force (e.m.f.) of the battery.
(b(i))[1]
Find the total resistance of wire CD together with the variable resistor.
(b(ii))[1]
State the current in wire CD.