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Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315

Solutions

Chapter
Section
BuyFindarrow_forward

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

While discussing electric motors: Technician A says that when there is high CEMF, there will be high current flow. Technician B says that if the reluctance of an electromagnet increases, its field strength increases. Who is correct?

  1. Technician A

  • Technician B
  • Both A and B
  • Neither A nor B
  • To determine

    The technician with correct approach while discussing electric motor.

    Explanation

    Given information:

    Technician A says that when there is high CEMF, there will be high current flow.

    Technician B says that if the reluctance of an electromagnet increases, its field strength increases.

    When the armature rotates in a magnetic field a small amount of self-generated voltage is induced in it. This induced voltage opposes the voltage supplied by the battery thus less current is flowing in the armature coils, as a result, the starting motor moves slowly and provide less torque to the engine.

    Thus, when the armature turns slowly a low amount of voltage induced in it therefore, a low CEMF is present in it passing a high current to flow and vice versa...

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