Types of Energy

For a flashlight to turn on, chemical energy from the batteries changes to electrical energy that flows to the lightbulb. The lightbulb changes electrical energy into light energy. What is this an example of?

• Energy transformation

• Energy exchange

• Energy being created

• Energy being destroyed

A child hitting a drum creates vibrations that produce:

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Energy is transferred from the Sun to Earth through and energy.

• light; electrical

• light; thermal

• sound; thermal

• sound; electrical

Identify the statement that correctly explains what happens when energy transfers in a system.

• About 75% of the energy is transferred, while the rest is destroyed.

• All of the energy is transferred in different amounts to different forms.

• Half of the energy is transferred in different amounts to different forms.

• Some of the energy gets transferred, while a portion is lost along the way.

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Electrical energy is transferred when an iron is plugged into an outlet. What type of energy does the electrical energy become?

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Thermal energy is

• the internal energy of an object due to the kinetic energy of its particles

• the external energy of an object due to its potential energy

• the internal energy of an object due to the stored energy of its particles

• the external energy of an object due to its exposure to the Sun

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When a person plucks the string on a guitar, energy is transferred.

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Which statement is true?

• A lamp changes heat energy to electrical energy.

• A lamp changes light energy to electrical energy.

• A lamp changes electrical energy to light and heat energy.

• You cannot change energy from one form to another.

Nuclear reactions in the Sun release .

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Frank placed a metal spoon in a glass bowl of hot soup. He then went back to get crackers. When he touched the spoon he was surprised to find that it was hot. Frank knew that the spoon was not hot when he put it in the soup. Which sentence best explains how this happened?

• The radiation from the microwave bounced onto the spoon.

• Spoons begin heating up when they are placed into liquids.

• Thermal energy is transferred from the soup to the spoon.

• Heat is created when metals and glasses combine with one another.

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