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A torch bulb is rated as 4.5V, 200 mA. I...

A torch bulb is rated as 4.5V, 200 mA. Its power is

A

2.25 W

B

4.4 W

C

0.9 W

D

9 W

Text Solution

Verified by Experts

The correct Answer is:
C
We have,
V= 4.5 V
`i= 200 mA= 200 xx 10^(-3) A= 0.2 A`
From,
`implies P= Vi`
`P= 4.5 xx 0.2`
`P= 0.9 W`
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