Question

Two electric bulbs A and B are marked 220V, 40W and 220V, 60W respectively. Which one of the two has greater resistance? Give reason to support your answer.​

Answer 1

Answer:

Given, two electrical bulbs.

Potential across first bulb, V1=220V

Potential of first bulb, P1=40W

Potential across second Bulb, V1=220V

Power of second bulb, P2=60W

Now, P=V^2/R. Or R=V^2/P

i.e, R inversly proportional to 1/P

Resistance is inversely proportional to power.

Therefore, first bulb having lease power has higher resistance.

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