Energy Transformations

Some students observing a classroom device being used, noticed an energy transfer from electrical → mechanical → sound. Which device were the students most likely observing?

• An electrical balance measuring an object’s mass.

• An electric pencil sharpener being used.

• A projector displaying a diagram on the screen.

• A flashlight used to light up a dark corner.

Which type of energy transformation occurs when a flashlight shines?

• chemical → thermal → electrical

• chemical → electrical → light

• thermal → chemical → light

• chemical → electrical → chemical

Tags

NGSS.MS-PS3-5

When water falls through a dam and turns a turbine connected to a generator, electricity is produced. Which of the following shows the energy transformations that occur to produce hydroelectric power?

• electrical → gravitational → mechanical

• chemical → mechanical → electrical

• mechanical → chemical → electrical

• gravitational → mechanical → electrical

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

The law of the conservation of energy states:

• Energy can be created, just not destroyed. It changes its form from one type to another.

• Energy can never be created nor destroyed. It can only change its form from one type to another.

• The total energy in our universe changes, as different forms of energies can be made into new types.

• Some energy will be lost each time a transformation occurs.

Tags

NGSS.MS-PS3-5

In an oven, electrical energy is converted to:

• Thermal energy

• Electromagnetic

• Electrical energy

• Chemical energy

Tags

NGSS.MS-PS1-4

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

• Electromagnetic and sound

• Chemical and electromagnetic

• Mechanical and electromagnetic

• Mechanical, electromagnetic, and thermal

An energy transfer or transformation is when:

• energy is created through conduction

• energy changes from one form to another

• two forces slide together that are touching

• a chemical reaction takes place

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4

In a toaster, electrical energy is converted to all of the following EXCEPT:

• Radiant (electromagnetic) energy

• Thermal energy

• Chemical energy

• Mechanical energy

When a fan is turned on, the fan begins to move. What is the energy transformation that is happening?

• Electric → mechanical

• Chemical → mechanical

• Electric → thermal

• Chemical → mechanical

Tags

NGSS.MS-PS3-5

Which of the following items would have this energy transformation: chemical energy → mechanical energy?

• person running

• candle burning

• windmill turning

• radio playing music