Brain Breakfast and Homework

Energy Transformations

Quick recap: what are the 7 main forms of energy?

Quick recap: what are the 7 main forms of energy?

• Chemical

• ​Sound

• Electrical

• Radiant/Light

• Mechanical

• Thermal

• Nuclear

Law of Conservation of Energy

The law states: Energy cannot be created nor destroyed.

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In other words...

Energy can only change its forms from one type to another.

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The energy of the world is constant because of the total amount of energy does not change.

The process of energy changing forms is called Energy transformations

You may also hear it referred to as Energy conversions

Energy Transformations can be multi-stepped.

Ex: Hairdryer

Electrical (plugging it in) --> Mechanical (spinning of the fan)--> Heat (hot air)

Let's look at a flashlight

• It runs on batteries (chemical energy)

• When it turns on, it's changed from chemical into electrical

• Then, it is transformed into light energy.

Multiple Choice

Which energy transformation occurs in a toaster?

• chemical to electric
• electric to thermal
• kinetic to chemical
• thermal to potential

Multiple Choice

Which type of energy transformation occurs when a flashlight shines?

• chemical → thermal → electrical
• chemical → electrical → light
• thermal → chemical → light
• chemical → electrical → chemical

Multiple Choice

Which of the following shows the correct order of the energy transformations that occur when green plants produce their food from the Sun’s energy?

• chemical → thermal
• light → chemical
• thermal → light
• chemical → electrical

Multiple Choice

A television works by transforming electrical energy into what other kinds of energy?

• Light, thermal, and sound
• Thermal, chemical, and solar
• Sound, mechanical, and electrical
• Light, chemical, and mechanical

Drag and Drop

The ​

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energy from the outlet transforms into ​

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energy to provide light to the room, but also ​

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energy (gets hot).

Drag these tiles and drop them in the correct blank above

electrical

radiant

thermal

nuclear

mechanical

Drag and Drop

The battery powered clock transforms ​

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energy into ​

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(sound) and ​

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(light from the display).

Drag these tiles and drop them in the correct blank above

chemical

mechanical

radiant

electrical

nuclear