A small heating element, connected to 10V d.c. supply draws a current of 5 A. How much electric energy is supplied to heater?

A small heating element connected to 10 V dc supply draws a current of 5 A . Find the electric power supplied to the heater .

A coil when connected across a 10 V d.c. supply draws a current of 2 A. When it is connected across 10 V - 50 hz a.c. supply the same coil draws a current of 1 A. Explain why? Hence determine self inductance of the coil.

An electric kettle connected to the 230V mains supply draws a current of 10 A. Calculate: (a) the power of the kettle. (b) the energy transferred in 1 minute.

An electric motor operator on 15 V supply, draws a current of 5 A and yields mechanical power of 60 W . The energy lost as heat in one hour (in kJ) is.

An electric heater of resistance 10Omega connected to 220 V power supply is immersed in the water of 1 kg. How long the electrical heater has to be switched on to increase its temperature from 30^(@)C to 60^(@)C . (The specific heat of water is s=4200J kg^(-1) /C )

An electric motor operating on 50 volt D.C. supply draws a current of 10 amp. If the efficiency of motor is 40% then the resistance of the winding of the motor is