The candidates were required to:
(i) connect the circuit as shown and take ammeter readings;
(ii) compare on the values of the currents entering a node and that leaving;
(iii) comment on the answer obtained in (g).
The expected answers were:
Table 1
11(mA) |
12(mA) |
13 (mA) |
11 + 12 (mA) |
0.222 |
0.025 |
0.252 |
0.247 |
(g) On comparing the values of 11 + 12 with that of 13, the two are the same or 11 + 12 = 13.
(h) This confirms Kirchhoff's Current Law (which states that the
algebraic sum of current into any junction is zero).
From the results obtained, the addition of the currents entering into a
node is equal the current going out of the node which is in consonance
with Kirchhoff's Current Law.
The candidates undertook the task by connecting the circuit using the
components provided and current through each ammeter. Their inability
to obtain correct measurements using the measuring instruments was
their undoing
