Electric Motor

Arun built a DC electric motor using whatever scrap material he had. Since he did not have a split ring, he used a full ring in contact with the brushes.

State what will be the effect of using a full ring on the movement of the axle in Arun's motor. Give a reason to your answer.

In a DC motor with a commutator, how many times does

i) the current in the armature coil change its direction during one rotation of the coil?

ii) the current stop flowing in the armature coil during one rotation of the coil?

Give the principle, construction, and working of 'Ball Mill'.

Name the arrangement in a DC motor to sustain the rotation of the armature in one direction.

What is the role of a commutator in a DC generator and an electric motor?

What is armature? Mention the function of armature in a motor.

Describe an armature.

What is an armature and what is its function?

What is an axle?. Mention its function

State the function of axel in an electric motor

Name two appliances in which an electric motor is used.

Electric motor can be is used in

What are some common applications of the electric motor?

What are split rings and brushes in an electric motor?

What is attached to make contact with slip rings?

If the field current increases, speed will _____.

Increased torque causes the dc motor to _____ in speed.

By decreasing the flux, the speed of the motor can be _____ (increased / decreased).

How does frequency affect motor speed?

Which of the following is not used in commercial electric motor?