Question

an electric bulb is rated 220 volt and 100 watt, when it is operated on 110 volt, the power consume will be:
a. 100 w
b. 75w
c. 50w
d. 25w​

Answer 1

Answer:

option ( d ).25w is correct.

Explanation:

Resistance of bulb.

$R = \frac{ {v}^{2} }{p} = \frac{ ({220})^{2} }{100} = 484ohm$

V = 110 v.

Power consumed

$p = \frac{ {v}^{2} }{R} = \frac{110 \times 110}{484} = 25w$

25 W power is consumed when it operated on 110 v.

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