Conductivity

Which of these materials is least useful as an insulator?

• Cardboard

• Aluminum

• Rubber

• Plastic

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Wires carrying electricity are usually covered with plastic to keep them from starting a fire. Why does the plastic keep the electricity from starting a fire?

• Plastic is a good insulator.

• Plastic can melt when heated.

• Plastic is softer than wire.

• Plastic conducts electricity.

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The ability of a metal to allow heat or electricity to pass through it.

• conductivity
• insulator
• mass
• density

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What is the BEST example of a conductor? 

• A wooden block
• A ceramic mug
• A glass cup
• A metal bowl

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Which of these is the best conductor of electricity?

• Glass rod

• Cotton string

• Plastic tubing

• Copper penny

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Which of the following is NOT an insulator?

• Wool
• Plastic
• Copper
• Styrofoam

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Gloves help keep your hands warm in winter because:

• They are conductors of heat.
• They are fuzzy.
• They are conductors of electrical energy.
• They are insulators.

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Why are metals useful for making electrical wire?

• Metals do not bend.
• Metals hold much heat.
• Metals are insulators.
• Metals are conductors.

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Which one is a conductor? 

• wood 
• iron 
• plastic spoon 
• paper 

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Which one is an insulator?

• Silver

• Copper

• Nickel

• plastic

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