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Question

An electric bulb is rated 220V and 100W. Power consumed by it operated on 110V is


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Solution

Step 1. Given data:

Rating of the bulb,

VoltageV = 220V,

Power = 100W

New voltage V1 = 110V.

Step 2. Formula used:

Power P=V2R, Where V= Voltage, R= Resistance.

Step 3. Calculations:

First, we have to determine the bulb's resistance using the given data.

As R=V2P=2202100=484Ω

We will use this resistance to find power in the second case.

Hence, P=V21R=1102484=25W

Thus, the power consumed by it operated on 110V is 25W.


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