Question

A circuit has fuse of 5A. What is the maximum number of 100W(220V) bulb that can be safely used in the circuit?

Answer 1

Answer:

11 bulbs

Explanation:

working resistance = 220×220/100

= 484

current = 220 / 484 = 0.45Amp

11 bulbs drawing the current 4.95amp (<5 )

12 bulb drawing the current 5.4amp ( >5amp)

So, the number of 100 watts bulbs to connect with out blowing the fuse are 11.