The expected answers were:
Table 2 (V = 12v to Earth) for Forward Polarity.
Position Of Switch S₂ |
Status Of L₁ |
Status Of L₂ |
Status Of L₃ |
Open |
ON |
OFF |
ON |
Closed |
ON |
OFF |
ON |
Table 2 (V = 12v to Earth) for Reverse Polarity.
Position Of Switch S₂ |
Status Of L₁ |
Status Of L₂ |
Status Of L₃ |
Open |
OFF |
OFF |
OFF |
Closed |
ON |
OFF |
OFF |
In experiment 2, which was an adaptive form of experiment 1, the state of the lamp particularly in lamp 3(L₃) was got correctly by many candidates but they failed to give the comments on the results as required in 2(i).
While a few candidates who got the states of the lamps correctly had their comments inconclusively done. It was expected that their answers would include the state o the bias of the diode.