Thermal and Electrical Energy

What happens to atoms when electricity or heat flows through a material?

• They move rapidly.

• They stop moving.

• They change color.

• They disappear.

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What is a key characteristic of metals that makes them good conductors?

• They have a high density.

• Their atoms are arranged to allow energy to flow freely.

• They are magnetic.

• They are shiny.

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Which metal is commonly used in electrical wires due to its excellent conductivity?

• Gold

• Copper

• Silver

• Lead

What is an example of a non-metal conductor?

(a)  

• Glass

• Wood

• Salt water
• Plastic

Which metal is commonly used in electrical wires due to its excellent conductivity?

(a)  

• Iron

• Copper
• Aluminum

• Steel

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What happens when salt and water are mixed together?

• They become shiny.

• They become a good conductor of electricity.

• They become a good insulator.

• They become magnetic.

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Why are electric wires covered with rubber or plastic?

• To make them longer

• To make them heavier

• To prevent energy from escaping

• To make them colorful

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NGSS.MS-PS1-3

Which of the following is a good insulator?

(a)  

• Copper

• Iron

• Aluminum

• Wood

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NGSS.MS-PS3-3

Why are electric wires covered with rubber or plastic?

• To make them magnetic.

• To make them look nice.

• To prevent energy from escaping.

• To make them heavier.

What is the purpose of using a cardboard sleeve for hot beverages?

• To make the cup look fancy.

• To keep the beverage cold.

• To trap heat and prevent burns.

• To make the cup heavier.

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