Question

A 1.25 kW heater works on a 220 V mains supply. What current rating would a suitable fuse have?

Options

• 2 A

• 5 A

• 10 A

• 13 A

Answer 1

10 A

Explanation:

Given: Potential difference (V) = 220 V

Power (P) = 1.25 kW = 1250 W

We know that,

I = `P/V`

I = `1250/220`

I = 5.68

∴ Safely exceeds 5.68 A. 10 A is the closest standard rating.