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Review Unit 6 Grade 4

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  • Name a common metal used in wires because it is an excellent conductor.
    Copper
  • Why is the outside of an electrical plug made of plastic?
    To act as an insulator and prevent electric shocks.
  • Name the three essential parts of a simple circuit.
    Power source, wires (pathway), and a load (e.g., a bulb).
  • Which part of a flashlight is usually an insulator to protect the user's hand?
    The plastic casing.
  • Is wood considered a conductor or an insulator?
    Insulator
  • Is gold a conductor or an insulator?
    Conductor
  • What is the thin wire inside a lightbulb that glows when heated called?
    Filament
  • Name one part of a flashlight made of a material that conducts electricity.
    The metal spring (or metal switch contacts)
  • What component in a circuit provides the electrical energy?
    Battery (or Cell)
  • What is the purpose of a switch in a circuit?
    To open or close the circuit (control the flow of electricity).
  • Is rubber an electrical conductor or an insulator?
    Insulator
  • What happens to the other bulbs in a series circuit if one bulb breaks?
    They all go out.
  • What is a "closed circuit"?
    A complete loop that allows electricity to flow continuously.
  • Why does salt water conduct electricity better than fresh water?
    It contains dissolved ions that carry the electric charge.
  • What do we call a material that allows electricity to flow through it easily?
    Conductor
  • If you increase the number of batteries in a simple circuit, what happens to the bulb?
    It shines more brightly.
  • If a circuit has a gap or a broken wire, it is called an ________ circuit.
    Open
  • What do we call a material that does NOT allow electricity to flow through it?
    Insulator
  • In a series circuit, if you add more bulbs, will they get brighter or dimmer?
    Dimmer
  • Does pure distilled water conduct electricity well?
    No (It is a poor conductor).
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