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A torch bulb is rated $5 V$ and $500 mA$ . What will be its power?

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2.5 W

2.7 W

2.8 W

2.3 W

answer is A.

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Detailed Solution

A torch bulb is rated

5 V

and

500 mA

. The power of the torch bulb will be

2.5 W .

Here, potential difference,

V = 5 V

current,

I = 500 mA

= \frac{500}{1000} A

= 0.5 A

Power of the torch bulb,

P = VI

\Rightarrow P = 5 \times 0.5

\Rightarrow P = 2.5 W

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