alleryAn electric bulb is rated 60 W at 220 V. What current does it draw when operating normally?
A0.27 A
B3.67 A
C13.2 A
D160 A
Answer & Solution
Correct answer: A. 0.27 A
1. Electrical power is $P = VI$, so $I = \dfrac{P}{V}$.
2. Substitute $P = 60\,\text{W}$ and $V = 220\,\text{V}$.
3. $I = \dfrac{60}{220} \approx 0.27\,\text{A}$.
4. The value 13.2 wrongly divides V by P instead of P by V.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 4 Electricity "Electricity", p.62_
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