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Science

9th

grade

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Electricity and magnetism

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12 questions

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  • 1. Multiple Choice
    30 seconds
    1 pt
    What is the purpose of a generator?
    to convert electrical energy to mechanical energy
    to convert chemical energy to electrical energy
    to convert mechanical energy to electrical energy
    to convert mechanical energy to heat energy
  • 2. Multiple Choice
    30 seconds
    1 pt
    A student is investigating how changing the size of the core of an electromagnet affects its strength.  Which of these is most likely the dependent variable in the student's investigation?
    the number of wire coils wrapped around the core
    the number of paper clips picked up by the electromagnet
    the voltage of the battery used in the circuit
    the size of the piece of iron used as the core
  • 3. Multiple Choice
    30 seconds
    1 pt
    Image

    How are fossil fuels used to generate electrical energy?

    Heat from burning fuel creates steam that spins a turbine.

    Heat from burning fuel spins magnets inside an electric motor.

    Heat from burning fuel causes an electric motor to produce a current.

    Heat from burning fuel creates steam that turns a transformer.

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