Explain in brief the function of an electric fuse in a domestic circuit. An electric heater of current rating 3 kW; 220 V is to be operated in an…

- Here \(\displaystyle \mathrm{P}=3 \mathrm{~kW}=3000 \mathrm{~W}, \mathrm{~V}=220 \mathrm{~V}, \mathrm{I}=\) ? P = V I \(\displaystyle \mathrm{I}=\frac{\mathrm{P}}{\mathrm{V}}=\frac{3000 W}{220 V}=13.63 \mathrm{~A}\) $\displaystyle 13$‧$\displaystyle 63$ A > Rating of fuse $\displaystyle 5$ A, therefore fuse wire will melt and break the circuit.