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Identify Energy Changes

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

'Identify Energy Changes' worksheet

Key stage:  KS 3

Year:  Year 7 Science worksheets

Curriculum topic:   Physics: Energy

Curriculum subtopic:   Energy Changes and Transfers

Difficulty level:  

Worksheet Overview

The great scientist Albert Einstein said:


Einsteins first law


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) energySound 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 every day.


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.

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