(i) A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V? Give a reason.

Given,

P = 5 KW = 5000 W,

V = 200 V

Current drawn i = $\frac{P}{V}$ = $\frac{5000 W}{200 V}$ = 25 A

Since, the appliance when in use will draw 25 A current, the fuse rated 8 A cannot be used because it will blow off as the current will exceed 8 A and the circuit wil break.

(ii) Safety devices which are connected to the live wire of a household electric circuit are switch and fuse.