Question

an electric motor of 1.5 kw power rating is operated in a domestic electric circuit of current rating 5A. what would happen when it is switched on? give reasons

Please its urgent.......

Answer 1

Power, P = 1.5 kW = 1500 W

Current, I = 5 A

So, the working voltage of the motor is, V = P/I = 1500/5 = 300 V

Now, the voltage of household power supply is 220 V. So, when it is switched on it wont run slow because of low voltage.

Answer 2

Power=1.5kw

Voltage=220v(general voltage in domestic circuit)

Power=voltage ×current

1.5×1000watts=220×current

1500=220×current

Current=1500÷220

Current drawn=6.81amps(approx)

But it is operated on 5A circuit

So it leads to overloading and thus short circuit