Science Topic 1 Lesson 4 review - Electric Circuits

Which object is the best example of a resistor?

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Which list names different forms of energy?

• copper, battery, switch

• phone, wire, earbud

• transform, transfer, circuits

• sound, light, heat

Which diagram shows current flowing through an electric circuit?

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Why is plastic a good choice for covering electrical wires?

• It allows electricity in one wire to come in contact with other wires more easily.

• It is a good insulator, so it keeps the flow of electricity in the wire.

• It is a good conductor of electricity, so it increases the flow of energy.

Which object is the best example of a conductor?

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Which object is the best example of a insulator?

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What is the best evidence that the source of the phone’s electric energy is a battery?

• The phone produces positive and negative charges.

• The phone has a switch, wires, and can be opened.

• The phone produces heat, sound, and light.

• The phone has a switch, earphones, and a plug.

Many people use electric stoves to cook food. The pictures show burners on an electric stove. One burner is on. The other burner is off. Which statement about the burner is likely true?

• The burner is made of a material that is an insulator. It stops energy from flowing out of the burner.

• The burner is made of a material that is an energy source. It controls the amount of heat produced by the light.

• The burner is made of a material that is a resistor. It changes electric energy into light and heat.

• The burner is made of a material that is a conductor. It allows heat energy to flow through a circuit.

In what parts of an electric circuit would you expect to find an insulator and a conductor?

• insulator: wire covering

  conductor: wires

• insulator: bulb

  conductor: wire covering

• insulator: wires

  conductor: source