Table of Contents
- 1 Why is it necessary for the current to reverse in the armature every half revolution?
- 2 Why is it important that the current in the coil of a motor changes direction every time the coil makes a half revolution?
- 3 Why is the direction of the current in an electric motor reversed after every half rotation?
- 4 What is the importance of alternating current?
- 5 Are commutator changes the direction of current in the coil of?
- 6 What is used to reverse the current?
Why is it necessary for the current to reverse in the armature every half revolution?
The split ring commutator reverse the current in the armature every half revolution when the commutator changes contact from one brush to another. This reverse in current causes the forces acting on the coil to be reversed. This helps the coil continue to rotate in a clockwise direction.
Why is it important that the current in the coil of a motor changes direction every time the coil makes a half revolution?
Answer: Explanation: After every half rotation, each side of the generator coil starts moving in the opposite direction. Thus, due to change in the direction of the motion of the two sides of the coil in the magnetic field after every half rotation, so the induced current also changes direction.
Why does a commutator reverse the current?
So the current in the coil becomes opposite. Thus the forces again reverse which makes the coil to continue it’s rotation along a single direction. So the commutator reverses the current in every half turn producing a steady torque and the armature coil rotates in a single direction.
What is used to reverse the direction of current in an electric motor?
The device which is used to reverse the direction of current in the coil of a motor is known as a commutator (or split ring). A device called a split ring or commutator consists of two conductive arcs separated by an insulator in an electric motor.
Why is the direction of the current in an electric motor reversed after every half rotation?
They look like a copper ring split in the middle. The function of the commutator rings is to reverse the direction of current flowing through the coil every time the coil just passes the vertical position during a revolution. Hence, the direction of current in the coil changes in every half rotation.
What is the importance of alternating current?
Alternating current is cheaper to generate and has fewer energy losses than direct current when transmitting electricity over long distances. Although for very long distances (more than 1000 km), direct current can often be better.
Why does the direction of induced current change in AC generator?
After every half rotation, each side of the generator coil starts moving in the opposite direction in the magnetic field. Thus, due to change in the direction of motion of the two sides of the coil in the magnetic field after every half rotation, the direction of induced current also changes.
What is the direction of induced current in AC generator?
Emf induced in an AC generator The direction of the induced emf is given by Fleming’s right-hand rule or the Lenz’s law. Fleming’s right-hand rule states that, stretch the forefinger, the middle finger and the thumb of the right hand such that they are manually perpendicular to each other.
Are commutator changes the direction of current in the coil of?
A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.
What is used to reverse the current?
The device which is used to reverse the direction of current in the coil of a motor is known as a commutator (or split ring).