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An electric bulb rated at 220 V, 100 W is connected with another bulb rated at 220 V, 60 W. If the voltage across the combination is 220 V, what is the power consumed by the 100 W bulb?

A. 100 W
B. 60 W
C. 80 W
D. 120 W

Answer :

Final answer:

The 100 W bulb consumes its rated power of 100 W when operated at its rated voltage of 220 V, regardless of other bulbs in the circuit. Therefore the correct option is (a).

Explanation:

The question asks about the power consumed by a 100 W bulb when connected with a 60 W bulb, both rated at 220 V voltage. To determine the power consumed by the 100 W bulb, we need to understand the concept of power, voltage, current, and resistance in electrical circuits. The power (P) consumed by an electrical device is related to the voltage (V) across it and the current (I) flowing through it, as stated in the formula P = V * I. When bulbs are connected in parallel, they each experience the same voltage.

The power consumed by the device is its power rating when operated at its rated voltage.

Therefore, in this case, the 100 W bulb consumes 100 W of power when the voltage across it is 220 V, its rated voltage.

This remains true regardless of the other bulbs in the circuit, as long as the 100 W bulb is operated at its rated voltage. Hence, the answer is (a) 100 W.

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