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Question

Electric supply of a house is through a 15 A fuse. When a 2000 W heater is used in this house, how many 100 W bulbs can be used simultaneously ? The supply is at 220 V, and the heater and the bulbs are rated for 220 V.

A
12
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B
13
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C
14
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D
15
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Solution

The correct option is B 13
The current drawn by the 2000 W heater is
I=PV=2000 W220 V=10011 A
The maximum current the bulbs can draw is
15 A10011 A=6511 A
Each bulb will take a current
I=PV=100 W220 V=511 A.
The number of bulbs that can be used is Maximum current the bulbs can drawCurrent drawn by each bulb
6511 A511 A=13.

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