Question

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

Answer 1

a. Given: P = 3 kW = 3000 W

V = 240 V

P = VI

⇒ I = `P/V`

⇒ I = `3000/240`

⇒ I = 12.5 A

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