U2 - Energy Transformations Review

What kind of energy transformation happens when you turn on a light switch?

• heat energy to motion energy

• motion energy to sound energy

• electrical energy to light energy

• chemical energy to light energy

Using the figure below, what evidence explains the energy transfer shown?

• The toasted bread is evidence that electrical energy is transferred to the toaster, where electrical energy is then transformed into thermal energy.

• The plugged-in toaster is evidence that electrical energy is transferred to the toaster, where electrical energy is then transformed into light energy.

• The toasted bread is evidence that chemical energy is transferred to the toaster, where chemical energy is then transformed into thermal energy.

• The plugged-in toaster is evidence that chemical energy is transferred to the toaster, where chemical energy is then transformed into electrical energy.

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The girl is using an electric hair drier.

Which kinds of energy is she using?

• electrical energy and heat energy

• electrical energy and light energy

• sound energy and energy of motion

• energy of motion and sound energy

Into which other kinds of energy does a light bulb transform electrical energy? Circle the letters of the two correct answers.

• chemical

• heat

• light

• motion

• sound

Electronic devices work differently and are designed to serve different purposes. Match the device to how it works, and how it affects people’s lives.

Groups:

(a) Flashlight

,

(b) Smart phone

,

(c) Portable music player

• light

• lots of information at your fingertips

• sound

• sound and light

• easy to take your music with you

• can see at night

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Using the figure, complete the model to show how energy is transferred from the lamp to the box.

• light

• From the lamp to the bulb

• heat

• From the wall outlet to the lmp

• electrical

• From the bulb to the box

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A circuit has a switch, a battery, and a bulb. When the switch is closed, the light turns on. What type of energy moves through the wires of this closed circuit?

• sound

• chemical

• electrical

• physical

The battery in Kelly’s cell phone lost its charge. She plugged the phone into its charger and plugged the charger into an outlet. When the phone was completely charged, Kelly noticed that the charger felt warm. Why did this happen?

• Some of the electrical energy was changed to light energy.

• Some of the electrical energy was changed to stored energy.

• Some of the electrical energy was changed to thermal energy.

• Some of the electrical energy was changed to chemical energy.

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Which phrase describes evidence that energy, in the form of heat, has been transferred?

• Wind blows and a windmill turns.

• Burnt toast comes out of a toaster.

• A radio is turned on and music is heard.

• A lamp is turned on and light can be seen.

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Energy cannot be created nor destroyed. Instead, energy is transformed. This means that energy has __________.

• changed

• increased

• decreased

• stayed the same

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