Question

A domestic circuit has 5A fuse. How many bulbs of rating 100W, 220V can be safely used in this circuit? Justify your answer.

Answer 1

Explanation:

p=200W

v=220v

But p=i^2 r

thus

i^2=200/220

i=0.953

that iz the current drawn by one bulb

now total number of bulbs that could be safely used is

5=n×0.953

n=4.8 which can be approximated to 5

thus 5 bulbs can be used that will draw a current less than 5A

Answer 2

Answer:see the attachment you will find of this question

A domestic circuit has 5A fuse. How many bulbs of rating 100W, 220V can be safely used in this circuit. Justify your answer.