Question

an electric heater is rated at 1.5kw ,220v find the safe amount of Current which can flow through it, can fuse of current rating 5A be used with it, what must be the current rating of the fuse​

Answer 1

• The fuse will melt and the circuit breaks if electric current more than the rating o fuse flows in the circuit. Electric current following in the circuit,

I = P/V = 1.5 × 1000W/220V = 6.82 A.

Since,

• Current flowing in the circuit which is 6.82 A is more than the rating of fuse which is 5A , therefore , the fuse will melt and the electrical heater doesn't work. To operate the heater, fuse of rating 10A is to be put in the circuit.