alleryA torch bulb is rated 3 V and draws a current of 600 mA. What electric power does it consume?
A1.8 W
B0.2 W
C5.0 W
D180 W
Answer & Solution
Correct answer: A. 1.8 W
1. Convert current: $600\,\text{mA} = 0.6\,\text{A}$.
2. Power is $P = VI$.
3. $P = 3 \times 0.6 = 1.8\,\text{W}$.
4. The value 180 forgets to convert mA to A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 4 Electricity "Electricity", p.64_
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