What is Energy? (Unit 2: Lesson 1)

Alonzo has a battery operated toy car. When he turns it on it moves across the floor. Which energy transformation happens in the toy car?

• sound energy to stored energy to electrical energy

• electrical energy to stored energy to motion energy

• motion energy to electrical energy to sound energy

• stored energy to electrical energy to motion energy

The girl is using an electrical appliance that has a motor. Which energy transformation is she using?

• electrical energy into sound and chemical energy

• electrical energy into heat and energy of motion

• sound into electrical energy and energy of motion

• energy of motion into electrical energy and sound

Roberto makes an electric circuit that has a switch as one of its parts. The diagram shows the circuit that he makes. What would happen to the light bulb if Roberto changed the switch from closed to open?

• It would be duller.

• It would be brighter.

• It would stop glowing.

• It would start glowing.

Which device converts electrical energy to light?

• lamp

• radio

• battery

• solar panel

The diagram shows one kind of power generating station that uses coal to produce electrical power. Which kind of energy transformation occurs in the spinning turbine?

• heat into electrical energy

• electrical energy into energy of motion

• energy of motion into electrical energy

• electrical energy into heat and energy of motion

Identify a source of electrical energy in your home. Then give an example of how this electrical source transforms electrical energy to a different type of energy.

Describe the energy transformations that happen in a television.