Unit 3 Electricity and Circuits

What is a property of matter that causes objects to attract or repel each other?

• compass

• electric charge

• electric circuit

• electric field

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Which is a characteristic of most electrical conductors?

• Positive charges move easily through them

• They are soft and flexible

• They can be cut easily

• Negative charges move easily through them

Which of these materials makes a good insulator of electricity?

• Plastics

• Salt Water

• aluminum foil

• silver

If one burned out bulb causes all of the lights to fail in a circuit, what might you conclude?

• It is a parallel circuit.

• More batteries are needed.

• It is a series circuit.

• A heavier wire is needed.

Two charged objects attract each other. Which statement is true?

• neither is positive

• they have the same charge

• neither is negative

• they have opposite charges

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Which of the following materials would you use to connect a battery and bulb so that the bulb would light?

• a wooden toothpick

• a strip of silver

• a rubber band

• a strip of plastic

How are cooper wire and aluminum foil alike?

• Negative charges can move through them easily.

• They are both silver-colored metals.

• They are both used to insulate wires.

• Negative charges can’t move through them.

Kate walked across a carpet and felt a shock when she touched a doorknob. What caused this?

• The knob was electromagnet.

• The knob was an insulator.

• Kate developed a static charge.

• The carpet was a conductor.

Which of the following is the best way to investigate static electricity?

• Fill a balloon with air and hold it near a magnet

• Rub one small balloon and one large balloon together

• Fill one balloon with helium and one with air

• Rub a balloon on a shirt and place it near a wall

Which material best conducts heat and electricity?

• metal

• rubber

• plastic

• wood

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