alleryTwo tungsten bulbs of 100 W and 60 W are connected in parallel across a 220 V supply. What is the total current drawn from the mains?
A0.27 A
B0.45 A
C0.72 A
D1.6 A
Answer & Solution
Correct answer: C. 0.72 A
1. In parallel the total power adds: $P = 100 + 60 = 160$ W.
2. Total current from the supply: $I = \dfrac{P}{V} = \dfrac{160}{220}$.
3. $I \approx 0.72$ A.
4. The option 0.45 A is the current of only the 100 W bulb ($100/220$), ignoring the 60 W bulb.
5. The option 0.27 A is the current of only the 60 W bulb ($60/220$), again counting just one bulb.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.70_
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