First slide

Electrical power

Question

A" B, C are identical bulbs. How does the brightness of A and B change when the switch S is closed ?

Moderate

A

The brightness of A increases and that of B decreases
B

The brightness of A does not change and that of B decreases
C

The brightness of both A and B decreases
D

The brightness of A increases and that of B does not . change

Solution

When the switch 5 is closed the resistance C comes in parallel with the resistance B, As B and C becomes in parallel, the resistance of combination is halved. As a result the resistance of the circuit decreases and current increases. But the current through B decreases. Hence the brightness of A increases and that of decreases.

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