a) What current is taken by a 3kW electric geyser working on 240V mains? b) What size fuse should be used in the geyser circuit?

Answer:

a) Given,

P = 3kW = 3000W

V = 240V

As we know that,

P = VI

I = P/V

Evaluating the value of current,

I = 3000/240

I = 12.5A

b) The size of the fuse that should be used in the geyser circuit is 13A.