Explain in brief the function of an electric fuse in a domestic circuit. An electric heater of current…
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 electric circuit of rating 5 A. What is likely to happen when the heater is switched 'ON' ? Justify your answer with necessary calculation.
Solution
It prevents damage to the appliances and the electrical circuit from overloading and short circuiting.
Here P = 3 kW = 3000 W, V = 220 V, I = ?
P = V I
I = P/V = 3000 W / 220 V = 13.63 A
13.63 A > Rating of fuse 5 A, therefore fuse wire will melt and break the circuit.