Electromagnetism Quiz
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Questions and Answers

What is the primary function of an electric generator?

  • To transform voltage levels
  • To store electrical energy
  • To convert mechanical energy to electrical energy (correct)
  • To convert electrical energy to mechanical energy

    • Which of the following does NOT affect the EMF of a wire moving in a magnetic field?

  • The magnetic field
  • The diameter of the wire in the field (correct)
  • The velocity of the wire in the field
  • The length of the wire in the field

    • When is the current zero in an electric generator?

  • When the wire segments move perpendicular to the field (correct)
  • When the wire segments move parallel to the field
  • During the first 180° of the wire’s rotation
  • It is never zero

    • What is the main difference between an electric generator and an electric motor?

    <p>The direction of energy conversion</p> Signup and view all the answers

    What is the effective voltage for most household wall outlets in the United States?

    <p>120 V</p> Signup and view all the answers

    What happens to the mechanical energy in an electric generator?

    <p>It is converted to electrical energy</p> Signup and view all the answers

    What happens to the current in the loop when it is in the vertical position?

    <p>It decreases to zero</p> Signup and view all the answers

    How often does the direction of the current in the loop change?

    <p>Each time the loop turns through 180°</p> Signup and view all the answers

    What is the primary function of a generator?

    <p>To convert mechanical energy to electrical energy</p> Signup and view all the answers

    What happens to the current in the loop as it rotates?

    <p>It alternates between zero and some maximum value</p> Signup and view all the answers

    What is the product of in a generator?

    <p>Current and voltage</p> Signup and view all the answers

    What is the purpose of the brush and slip-ring arrangement?

    <p>To allow the armature to turn freely while passing current into the external circuit</p> Signup and view all the answers

    What is the relationship between the average power PAC and the maximum power Pmax?

    <p>PAC = ½Pmax</p> Signup and view all the answers

    How is the effective current Ieff related to the maximum current Imax?

    <p>Ieff = 0.707Imax</p> Signup and view all the answers

    What is the frequency of voltage oscillation in the United States?

    <p>60 Hz</p> Signup and view all the answers

    What is the relationship between the effective voltage Veff and the maximum voltage Vmax?

    <p>Veff = 0.707Vmax</p> Signup and view all the answers

    What is the formula to express the average power PAC in terms of effective current Ieff and resistance R?

    <p>PAC = Ieff^2R</p> Signup and view all the answers

    What is the value of effective voltage Veff in a typical US wall outlet?

    <p>120 V</p> Signup and view all the answers

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