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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

$= \frac{V^{2}}{P} = \frac{200 \times 200}{100} = 400 Ω$

When bulb is applied across $160 V$ ,

Current in bulb $= \frac{160}{400} A$

Power consumption $= V I = 160 \times \frac{160}{400} = 64 W$

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Current Electricity - Result Question 83

88. A (100W,200V) bulb is connected to a 160V power supply. The power consumption would be

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Answer:

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88. A $(100 W, 200 V)$ bulb is connected to a $160 V$ power supply. The power consumption would be