$(a)$ Explain the difference between direct current and alternating current. Write one important advantage of using alternating current.
$(b)$ An air conditioner of $2 \,kW$ is used in an electric circuit having a fuse of $10 \,A$ rating. If the potential difference of the supply is $220 \,V$,will the fuse be able to withstand the current when the air conditioner is switched on? Justify your answer.

(B) The current whose direction reverses periodically is called alternating current $(AC)$,whereas direct current $(DC)$ flows in a constant direction.
The primary advantage of $AC$ is that it can be transmitted over long distances with minimal power loss compared to $DC$.
$(b)$ Given: Power $(P)$ = $2 \,kW = 2000 \,W$,Voltage $(V)$ = $220 \,V$.
Using the formula $P = VI$,the current $(I)$ is calculated as:
$I = \frac{P}{V} = \frac{2000}{220} \approx 9.09 \,A$.
Since the calculated current $(9.09 \,A)$ is less than the fuse rating of $10 \,A$,the fuse will withstand the current and will not blow off when the air conditioner is switched on.