The candidates were expected to connect the circuit as shown in Fig.2, measure and record in Table 2 the voltmeter and ammeter readings. They were also required to plot a graph of voltage V(V) against current I(A) and comment on the slope of the graph.
The expected answers were:
Table 2
(c)
Power supply voltage Vs(V) |
V(V) |
I(mA) |
4 |
1.7 |
1.0 |
6 |
2.4 |
1.5 |
8 |
3.3 |
2.0 |
10 |
4.1 |
2.4 |
12 |
5.0 |
2.9 |
(j) The slope of the graph was 1.71 kΩ.
Candidates’ performance in this question was better than that of Question 1. The voltage and current readings obtained and the graph plotted compared favourably with those provided in the marking scheme.