Question

A domestic circuit has 5a fuse how many bulbs of rating 100w 220v can be safely used in the circuit justify

Answer 1

Suppose x number of such bulbs can be used. Power of one bulb =100 watt Power of x bulbs (p)= 100 × x watts Potential difference (V) =220 volts I=5 A We know that P= V I 100x =200 ×5 x = 11 bulbs.