Current Electricity - Result Question 83
88. A $(100 W, 200 V)$ bulb is connected to a $160 V$ power supply. The power consumption would be
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======= ####88. A $(100 W, 200 V)$ bulb is connected to a $160 V$ power supply. The power consumption would be
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $125 W$
(b) $100 W$
(c) $80 W$
(d) $64 W$
[1997]
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Answer:
Correct Answer: 88. (d)
Solution:
- (d) Power $=100 W$, Voltage $=200 V$
Resistance of bulb
$=\frac{V^{2}}{P}=\frac{200 \times 200}{100}=400 \Omega$
When bulb is applied across $160 V$,
Current in bulb $=\frac{160}{400} A$
Power consumption $=VI=160 \times \frac{160}{400}=64 W$
