Electronics Input/Output Devices Quiz
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Questions and Answers

What is an example of useful work being done by devices inside a black box?

  • Generating heat energy
  • Rotating the stator of a motor (correct)
  • Creating hysteresis effects
  • Creating eddy currents in transformers
  • When can we be certain that power is entirely converted into heat energy?

  • When the Ohm's law is substituted into the generalized power equation (correct)
  • When driving chemical reactions
  • When generating radio waves
  • When creating hysteresis effects
  • What is the common term used for the power lost due to heating in a system?

  • Joule heating (correct)
  • Ohmic cooling
  • Ohmic loss
  • I2R cooling
  • Why is assuming a black box is a 100-Ω resistor generating heat energy an erroneous assumption?

    <p>It doesn't account for devices performing useful work</p> Signup and view all the answers

    What term is used to describe the heating caused by the resistance of a material to the flow of an electric current?

    <p>Joule heating</p> Signup and view all the answers

    Which type of energy conversion does Joule heating represent?

    <p>Electrical energy to heat energy</p> Signup and view all the answers

    What would happen if all power drawn by a black box was converted only into useful work without any losses?

    <p>The black box would violate the law of conservation of energy</p> Signup and view all the answers

    What does Ohm’s law describe in relation to the generalized power equation in circuits?

    <p><em>P = IV</em></p> Signup and view all the answers

    What happens when people treat any load (black box) as a resistor during circuit analysis?

    <p>They may overlook devices performing useful work inside the load</p> Signup and view all the answers

    What causes eddy currents in transformers that contribute to power loss?

    <p>Magnetic field generation</p> Signup and view all the answers

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