DC Motors
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Questions and Answers

What type of current does a DC motor use?

  • Variable current (VC)
  • Direct current (DC) (correct)
  • Alternating current (AC)
  • Fluctuating current (FC)

    • What do nearly all types of DC motors rely on to produce magnetic forces?

  • Resistance in the coils
  • Voltage in the coils
  • Capacitance in the coils
  • Currents in the coils (correct)

    • How can a DC motor's speed be controlled over a wide range?

  • Using a fixed supply voltage and changing the resistance of the coils
  • By varying the number of coils in the motor
  • By adjusting the frequency of the input current
  • Using either a variable supply voltage or by changing the strength of current in its field windings (correct)

    • In what type of motor can a lightweight brushed motor used for portable power tools and appliances operate?

    <p>Universal motor</p> Signup and view all the answers

    What has made replacement of DC motors with AC motors possible in many applications?

    <p>The advent of power electronics</p> Signup and view all the answers

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