The armature of a dc motor has `20 Omega` resistance It draws a currrent of `1.5` A when run by a `220 V` dc supply The value of the block emf induced in it is .

The armature of a DC motor has 20Omega resistance. It draws a current of 1.5 A when run by 200 V DC supply The value of back emf induced in it will be

The armature of a DC motor has 20Omega resistance. It draws a current of 1.5 A when run by 200 V DC supply The value of back emf induced in it will be

The armature of a DC motor has 20Omega resistance. It draws a current of 1.5 A when run by 200 V DC supply The value of back emf induced in it will be

The armature of dc motor has 20Omega resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. the value of back e.m.f. induced in it will be

The resistance of the armature of an electric motor is 55 ohm. The motor draw a current of 2 A when running at 220 V. What is the back e.m.f ?

The resistance of the armature of a dc motor is 50 Omega . A power supply of 200 V is connected across it and the current through the armature is 2A. What is back emf ?

A heater of resistance 140 Omega capable of carrying a current of 1.2 A is put in a dc mains of 210 V. Find out the minimum value of an additional resistance to be added to run the heater.

A d.c motor has internal resistance 4 ohms . It is operated at 220 volts and draws 5 ampere current . The useful mechanical power developed is :-