Question

A television set having a power rating of 140W and electric lawn-mower of power rating 1 kW are both connected to a 240V supply. If 3A, 5A and 10A fuses are available state which is the most appropriate for each appliance and why.

Answer 1

Answer:

3A for television set and 5A for lawn mover set.

Explanation:

power = voltage*current

∴ for TV set current = $\frac{140}{240}$A

hence the fuse should be the least possible value

similarly for lawn mover

current = 1000/240

             =4.17 A

hence the fuse should be of 5 A