Two wires, A and B, are tested separately. For wire A the following data were obtained:
V (V)
I (A)
1.5
0.050
3.0
0.100
4.5
0.150
6.0
0.200
For wire B the observations were:
V (V)
I (A)
1.5
0.042
3.0
0.080
4.5
0.112
6.0
0.138
(a) Plot I–V graphs for wires A and B on the same pair of axes.
(b) From each graph determine the resistance of wire A and of wire B.
(c) State, giving a reason from the appearance of the graphs, which wire follows Ohm’s law more closely.
(d) The two wires are now connected in parallel across a source of 9V. Using your answers from part (b), calculate the total current drawn from the source.