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Question

A lamp is marked 60 W, 220 V. If it operates at 200 V, the rate of consumption of energy will _____

A

decrease

B

increase

C

remain unchanged

D

first increase then decrease

Medium

Solution

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Correct option is
A

decrease

Given power of bulb =60W
Voltage=220V
Power
         (1)
When voltage = 200V, resistance will be the same
From 1,



We see that  power gets decreased.
Power means rate of consumption of energy, so rate of consumption of energy decreases.
Option A is correct.

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