First slide

Electrical power

Question

Figure shows three similar lamps P,Q and R connected across a power supply. If the lamp R fuses, how will the light emitted by P and Q change?

Difficult

A

No change
B

Brilliance of P decreases and hat of Q increases
C

Brilliance of both P and Q increases
D

Brilliance of both P and Q decreases

Solution

before fusing resistance raio 2:1 potential across P $\frac{2 V}{3}$ after fuse potential across P $\frac{v}{2}$ as resistance ratio is 1:1 so brilliance of P decreases and Q increases as Power= $\frac{V^{2}}{R}$

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