Lesson 6.2 - Energy Transfers and Transformations

Which sequence of energy transformation is happening in this image?

• electrical to thermal to radiant

• thermal to electrical to radiant

• electrical to radiant to thermal

• radiant to electrical to thermal

Answer explanation

Electrical energy is converted to radiant energy by the microwave, and radiant energy becomes thermal energy in the popcorn.

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In what situation can energy be created or destroyed?

• in a nuclear reaction

• when solar energy is used

• when work is done

• never

Answer explanation

According to the law of conservation of energy, energy can not be created or destroyed.

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NGSS.MS-PS1-5

Which type of energy is always generated, at least in small amounts, when an energy transfer or transformation occurs?

• potential energy

• thermal energy

• chemical energy

• radiant energy

Answer explanation

Some energy is transformed into thermal energy any time an energy transfer or transformation occurs.

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Which energy resource is a nonrenewable energy resource?

• hydroelectric

• natural gas

• wind

• geothermal

Answer explanation

Natural gas is a non-renewable energy resource.

Which of the following must be transformed into electrical energy when biomass is used as an energy resource?

• chemical energy

• mechanical energy

• nuclear energy

• radiant energy

Answer explanation

Chemical energy is transformed to electrical energy in a biomass energy plant.

A movement of energy from one object to another without a change in the form of energy is called

• energy tranfer.

• energy reversal.

• energy transformation.

• work.

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Which statement describes an energy transformation?

• Electric energy travels from a power plant to homes.

• Mechanical energy moves from a tennis racquet to a ball.

• Chemical energy in a log changes to thermal energy when the log burns.

In which case is work being done?

• A boy is holding a baseball.

• A baseball is flying through the air.

• A bat hits a baseball to an outfielder.

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What is a renewable resource?

• biomass

• natural gas

• coal

• petroleum

True or False: A system that exchanges matter or energy with the environment is a closed system.

• True

• False

Answer explanation

It is an open system.