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VoltageCapacitanceCurrent MCQ 3
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VoltageCapacitanceCurrent MCQ 3

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Questions and Answers

In electroplating by electrolysis, what happens at the iron cathode?

  • Alignment in the north-south direction
  • Formation of bubbles of gas
  • Heating up
  • Coating in copper (correct)

    • What does an electric current convert into when passing through any resistor?

  • Chemical energy
  • Potential energy
  • Magnetic energy
  • Heat energy (correct)

    • What is the main purpose of using an element in a kettle or an electric heater?

  • Cooling down the resistor
  • Converting electrical energy into heat (correct)
  • Creating a magnetic field
  • "Improving appearance"

    • What is another name for the thin layer formed on a metal in the electroplating process?

    <p>Precious coating</p> Signup and view all the answers

    Why is it beneficial to have high voltage power lines?

    <p>Looses less heat energy</p> Signup and view all the answers

    What is the main purpose of an electromagnet based on the magnetic effect of an electric current?

    <p>To generate a magnetic field</p> Signup and view all the answers

    What happens to a resistor when an electric current passes through it?

    <p>It heats up</p> Signup and view all the answers

    What is the role of a resistor in converting electrical energy to heat?

    <p>It dissipates electrical energy as heat</p> Signup and view all the answers

    What do electromagnets utilize to function in various applications?

    <p>Magnetic effect of electric current</p> Signup and view all the answers

    Which effect of electric current can be either useful or problematic depending on the application?

    <p>Heating effect</p> Signup and view all the answers

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