The candidates were required to
- connect the circuit shown and take ammeter readings;
- calculate the slope of the graph and comment on the shape of the graph;
- state the law the relationship in (i) obey.
The expected answers were:
Voltage Reading (V) |
Ammeter Reading (mA) |
0 |
0.000 |
2 |
166.700 |
4 |
333.300 |
6 |
500.000 |
8 |
666.700 |
10 |
750.000 |
12 |
833.300 |
From the results obtained, the graphical representation showed clearly that the graph was linear which is in consonance with Ohm’s law.
The candidates understood the task, connected the circuit and obtained readings but the ill-understanding of the position of the pointer of the measuring instrument was evident in the tables they came up with and the graphs plotted.