# Energy Changers

In this worksheet, students will look at how energy changers convert energy from one form to another.

Key stage:  KS 3

Curriculum topic:   Physics: Energy

Curriculum subtopic:   Energy Changes and Transfers

Difficulty level:

### QUESTION 1 of 10

The great scientist Albert Einstein said:

Energy changers are devices that convert energy from one form to another. For example:

A car engine converts the chemical energy stored in petrol into kinetic (movement) energy. Sound and heat (thermal) energy are also produced.

We use energy changers to change energy from one form into a form that we can put to a specific use. Listed below are some examples of energy changers that we use everyday.

Kettle  electrical energy into thermal (heat) energy

Torch  chemical energy (in batteries) into light and thermal energy

Television  electrical energy into sound and light

Loudspeaker  electrical energy into sound energy

A diver  gravitational potential energy into kinetic (energy) as he falls into the water

These examples all show how energy can be converted into a form that we can put to use. Even you are an energy converter!

You convert the chemical energy stored in your food into kinetic energy (to make you move), thermal energy (to keep you warm) and electrical energy (all the signals sent around your body to and from the brain are electrical signals)

Energy converters are not perfect and some of the energy they change is wasted.  In the car engine, for example, the petrol is converted into kinetic energy (which you want), but sound and thermal energy are also produced. The sound and thermal energy are wasted energy because not all the energy contained within the petrol is being converted into kinetic energy to move the car.

Let's have a look at some more energy converters.

Which scientist is quoted as saying:

"Energy can not be created or destroyed, it can only be transferred from one form to another"?

Isaac Newton

Albert Einstein

James Joule

Type the sentence out again in the answer box below and fill in the gaps with the correct words. Don't forget the full stop!

Energy converters _________ energy from one form to ________ form.

Which of the following are types of energy?

Thermal

Kinetic

Plastic

Metal

Gravitational

Which of the following is designed to convert electrical energy into heat?

Select the correct letter from the list below.

A Petrol-powered car

B Loudspeaker

C Kettle

A

B

C

Which of the following are good stores of chemical energy? Select all the answers that you think are correct.

Battery

Food

Wind

Water

Petrol

A torch converts chemical energy in a battery into light and thermal energy.

Which of the following is energy wasted during the conversion?

chemical

thermal

light

A car engine converts chemical energy stored in petrol or diesel into kinetic energy to move the car, and thermal energy and sound energy are also produced.

Which TWO of the following types of energy is wasted energy produced by the car engine?

Chemical

Sound

Kinetic

Heat

• Question 1

Which scientist is quoted as saying:

"Energy can not be created or destroyed, it can only be transferred from one form to another"?

Albert Einstein
EDDIE SAYS
All three of the Scientists listed have done a lot of work to help our understanding of energy.
• Question 2

Type the sentence out again in the answer box below and fill in the gaps with the correct words. Don't forget the full stop!

Energy converters _________ energy from one form to ________ form.

Energy converters convert energy from one form to another form.
EDDIE SAYS
Energy converters are a complicated name that can be given to everyday objects that use energy in one form or another.
• Question 3

Which of the following are types of energy?

Thermal
Kinetic
Gravitational
EDDIE SAYS
Energy can take many forms, but plastic and metal are materials, not energy forms.
• Question 4

Which of the following is designed to convert electrical energy into heat?

Select the correct letter from the list below.

A Petrol-powered car

B Loudspeaker

C Kettle

C
EDDIE SAYS
The kettle converts electrical energy into heat (thermal) energy. The car converts chemical energy (in the petrol) into kinetic (movement) energy, and sound and heat (thermal) energy are also produced. A loudspeaker converts electrical energy into sound energy.
• Question 5

Which of the following are good stores of chemical energy? Select all the answers that you think are correct.

Battery
Food
Petrol
EDDIE SAYS
Chemical energy is stored in batteries, petrol and food and can be converted into a form of energy that we can use.
• Question 6

A torch converts chemical energy in a battery into light and thermal energy.

Which of the following is energy wasted during the conversion?

thermal
EDDIE SAYS
A torch is designed to produce light. The thermal energy produced is wasted energy.
• Question 7

A car engine converts chemical energy stored in petrol or diesel into kinetic energy to move the car, and thermal energy and sound energy are also produced.

Which TWO of the following types of energy is wasted energy produced by the car engine?

Sound
Heat
EDDIE SAYS
The heat energy produced can be used to heat the cabin of a car on a cold morning but it is classed as wasted energy as most of the heat produced is lost.
---- OR ----

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