Question

A circuit can bear a maximum load of 5A. How many lamps of rating 10W,220V can simultaneously run on this line safely?

Answer 1

P=VI

I=P/V

$= \frac{10}{220} = \frac{1}{22} \\ \frac{1}{22} \times x = 5 \\ x = 5 \times 22 \\ x = 110 \: lamps$