Question

Three fuses available are rated at 2 A, 10 A and 13 A. Which fuse would you chose for an electric wire rated at 3 kW, 250 V? Show how you arrived at your answer.

Answer 1

Given power P = 3k W = 3000 W, Voltage = 250 V

We know that, P =VI

`"I" = "P"/"V" = 3000/250 = 12 "A"`

Thus am aximum of 12 A current can pass through the electric wire

and a fuse of rating 13 A should be used with it