Unit 2- Les 4-6 Energy

A device that uses an electric current to produce motion is a

• motor

• turbine

• solar cell

• generator

Which of the following is a renewable resource?

• oil

• coal

• sunlight

• natural gas

When someone says that they are "using energy", they are talking about

• creating stored energy

• releasing stored energy

• destroying stored energy

• converting light to stored energy

A nonrenewable resource is a resource that

• comes directly from an organism

• does not cause harm to the environment

• is produced by nature, not people

• cannot be replaced as quickly as it is used

The energy of motion is used by _____ to produce an electric current

• motors

• batteries

• magnets

• generators

Which of these objects have stored energy?

(click all)

• a tank of gasoline

• a rock on the ground

• a dam blocking water

• a charged battery

What is an electric current?

• a mix of heat and sound

• a collision of objects

• a group of magnets

• a flow of electric charges

Which of the following is true of energy carried by sound, light, and heat?

• the energy is always stored

• the energy does not transfer

• the energy is conserved

• the energy cannot be produced by an electric current

When stored energy is efficient, it

• is destroyed when it is released

• is an expensive form of energy

• is used for producing sound, heat, or light

• is useful without creating a lot of wasted energy

To transfer energy carried by light to an electric current you need a

• turbine

• generator

• battery

• solar cell