(a)[1]
Define the ohm in terms of potential difference and current.
(b(i).1)[1]
Calculate the battery current $I$.
(b(i).2)[2]
Calculate the value of the resistance $R_Z$.
(b(i).3)[2]
Calculate the value of the e.m.f. $E$.
(b(ii).1)[2]
Resistors X and Y are each made of wire. The two wires share the same length and are made from the same metal. Determine the ratio of the cross-sectional area of wire X to the cross-sectional area of wire Y.
(b(ii).2)[2]
Resistors X and Y are each made of wire. The two wires share the same length and are made from the same metal. Determine the ratio of the average drift speed of free electrons in X to the average drift speed of free electrons in Y.