Science unit 2 review

What is an insulator?

• A device that keeps to much current from flowing through wires

• A switch that protects circuits from currents that are too high

• A material through which currents cannot move through easily

• A loop of wire that generates an alternate current

All of the following is an example of thermal energy EXCEPT the energy produced by-

• Rubbing your hands together

• Hot plat boiling water

• Plugging in a portable radio

• Burning wood in a fire place

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What part of the lamp system show.n above could be removed and the lamp still work?

• The lamp shade

• The electrical cord

• The light bulb

• The wall outlet

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What is the function of the wire in the diagram?

• Starting and electrical charge

• Reversing the electrical charge every second

• Absorbing the flow of electricity from the surrounding air

• Providing a way for the electricity to flow through the circuit

When a switch is used in an electrical circuit, the switch can

• Cause the charge the to build

• Increase and decrease the voltage

• Cause the current to change directions

• Stop and start the flow of the current

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Which object is most likely to conduct electricity?

• Iron nail

• Plastic straw

• Wooden stick

• Glass lens

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Which forms of energy from the sun reaches Earth?

• Light and mechanical

• Thermal and electrical

• Light and thermal

• Mechanical and thermal

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What form of energy is being used when a person pushes heavy boxes across the floor?

• Electrical energy

• Mechanical energy

• Thermal energy

• Sound energy

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Electrical wires are coated with a rubber or plastic because these materials are good…

• Resistors

• Magnets

• Insulators

• Conductors

The picture shows a spoon being used to stir a pan of hot soup. Which of the following spoon handle would get hot the quickest?

• Metal spoon

• Plastic spoon

• A rubber spoon

• A wood spoon

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