The candidates were required to
(i) connect the circuit as shown and take voltmeter readings;
(ii) evaluate the voltage drops across each branch in the circuit;
(iii) evaluate the current flowing in each branch of the circuit;
(iv) make a comment on the currents in the circuit.
The expected answers were:
|
V1(v} |
Vz(v) |
V3(v) |
Voltmeter |
-3.4 |
-0.4 |
8.6 |
reading |
|
|
|
(k)
(i)
VdR1 =-3.429/10 = -0.3429 A
(ii) Vz/Rz =-0.429/5 = -0.0858 A
(iii) V3/R3 = 8.571/20 = 0.4286 A
(I) The addition of 11 and 12 gives 13 irrespective of the polarity
The candidates understood the task, connected the circuit and obtained readings with a good
number obtaining accurate readings, performing the required calculations. However, some did not
obtain accurate readings, even though they performed the calculations, their results were incorrect.
Their inability to obtain accurate readings impacted negatively on their performance