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What is the role of a commutator in a DC motor?

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Question: What is the role of a commutator in a DC motor?

Options:

  1. To convert AC to DC
  2. To reverse the direction of current
  3. To increase voltage
  4. To decrease resistance

Correct Answer: To reverse the direction of current

Solution: 

The commutator in a DC motor reverses the direction of current in the coil every half turn, ensuring continuous rotation in one direction.

What is the role of a commutator in a DC motor?

Practice Questions

Q1
What is the role of a commutator in a DC motor?
  1. To convert AC to DC
  2. To reverse the direction of current
  3. To increase voltage
  4. To decrease resistance

Questions & Step-by-Step Solutions

What is the role of a commutator in a DC motor?
Correct Answer: The commutator reverses the direction of current in the coil.
  • Step 1: Understand that a DC motor has a coil of wire that spins when electricity flows through it.
  • Step 2: Know that the coil needs to keep spinning in the same direction for the motor to work properly.
  • Step 3: Realize that as the coil turns, the direction of the current in the coil would naturally change, which could stop the spinning.
  • Step 4: Learn that the commutator is a part of the motor that helps solve this problem.
  • Step 5: The commutator switches the direction of the current in the coil every half turn.
  • Step 6: This switching keeps the coil spinning in the same direction, allowing the motor to run continuously.
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