(a) 'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V?

(b) Name two safety devices which are connected to the live wire of a household electric circuit.

From relation

I = $\dfrac{P}{V}$

Substituting the values we get,

$I = \dfrac{5000}{200} \\[0.5em] I = 25 A$

Current that will flow through the electrical appliance is 25 A. However, the fuse is rated 8 A. Hence, such fuse cannot be used with this electrical appliance.

(b) The two safety devices which are connected to the live wire of a household electric circuit are switch and fuse.