Question

A circuit has a fuse of 5A . Find the maximum number of 100W,220V lamps that can be used in the circut.

Answer 1

suppose x number of such bulbs can be used
power of one bulb=100W
power of x bulbs is 100xW
we know that Power= V×I
I=5A
V=220V
$100x = 220 \times 5 \\ x = \frac{220 \times 5}{100} \\ x = 11$
hence 11 bulbs can be used