Question

What is the maximum number of 60 W bulbs that can be run from the mains supply of 220 volts if you do not want to overload a 5 A fuse?

Answer 1

Given: V = 220 V

I = 5 A

Let the maximum number of bulbs be y.

Power of y bulbs,

P = 60y

We know that,

P = VI

⇒ 60y = 220 × 5

⇒ 60y = 1100

⇒ y = `1100/60`

⇒ y = 18.33

∴ The number of bulbs required is 18.