Electricity 2

14 Questions

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Electricity Quizzes & Trivia

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Questions and Answers
  • 1. 
    The image shows a potential difference-current graph which follows Ohm's law, we know this because the graph is linear, and has a constant slope. 
    • A. 

      True

    • B. 

      False

  • 2. 
    When is the potential difference not proportional to the voltage?
    • A. 

      When the temperature remains constant

    • B. 

      When the temperature differentiates

    • C. 

      When the conductivity of the circuit remains constant

    • D. 

      When the resistance of the circuit remains constant

  • 3. 
    This one will require some thinking. Given that V = IR, we deduce that R = ___Further, if the slope of the graph is extremely low, then V/I, will be high, thus, we conclude that if the slope is low, resistance is ____, and if the slope is high, the resistance is ___
    • A. 

      V/I, low, high

    • B. 

      I/V, high, low

    • C. 

      I/V, low, high

    • D. 

      V/I, high, low

  • 4. 
    The following is a graph of a light bulb. The derivative is decreasing, thus, we see that resistance______ as it gets hotter, this is due to more frequent collisions between electrons and metal atoms.
    • A. 

      Increases

    • B. 

      Decreases

  • 5. 
    The following shows the graph of a diode. Once the potential difference reaches a _____ value, the component ______ Ohm's law, given that the temperature remains constant
    • A. 

      Minimum, does not follow

    • B. 

      Minimum, follows

    • C. 

      Maximum, follows

    • D. 

      Maximum, does not follow

  • 6. 
    A diode completely resists current if the voltage is below a certain value, even if that value is negative
    • A. 

      True

    • B. 

      False

  • 7. 
    Electricity can be dangerous, and cause electric shocks. What can these shocks do?
    • A. 

      Interfere with nerve signals from brain to body

    • B. 

      Cause heart attack

    • C. 

      Cause muscle spasms

    • D. 

      Cause breathing difficulties

    • E. 

      Death

    • F. 

      Overheated and faulty appliances

    • G. 

      Electrical fires

  • 8. 
    Check some precautions to make electricity safer
    • A. 

      Use a fuse (short wire designed to melt and separate in event of excess current)

    • B. 

      Earth wire (provide an alternative path if appliances develop faults)

    • C. 

      Double insulation (plastic casing without wires connected to case, so case cannot become live)

  • 9. 
    Energy is measured in ______
  • 10. 
    What's the formula for energy?
    • A. 

      E = VIt

    • B. 

      E = VI

  • 11. 
    1 Watt = 1 Joule per second --> 1 W = 1 J/s
    • A. 

      True

    • B. 

      False

  • 12. 
    Power is measured in?
  • 13. 
    What's the formula for power?
    • A. 

      P = VIt

    • B. 

      P = VI

  • 14. 
    Select the advantages of placing bulbs in a parallel circuit
    • A. 

      If one blows, the others with still run

    • B. 

      Each branch is delivered the same voltage

    • C. 

      You can place switches to control specific light bulbs