Science - Energy
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What is energy?
This is the ability to do work or move something
What unit is used to measure energy?
What is work?
This is done when a force moves a body
What unit is used to measure work?
How is work calculated?
Work (J) = Force (N) x Distance (m)
List the different types of energy
- Potential Energy
- Magnetic Energy
- Sound Energy
- Kinetic Energy
- Chemical Energy
- Nuclear Energy
- Heat Energy
- Light Energy
- Electrical Energy
What is heat energy?
This is a form of energy that causes the temperature to rise when it is added
What is light energy?
This is a form of energy that travels in waves and is used to allow us to see things
What is electrical energy?
This is the energy carried by electric currents
What is sound energy?
This is caused by vibrations that pass through the air to you ear which allows us to hear
What is chemical energy?
This is the energy stored in the bonds between atoms
This is stored in oil, gas and food
What is potential energy?
This is the stored energy just waiting to do work eg. water at the top of a waterfall
What is gravitational potential energy?
This is the energy stored when something is raised to a height
What is elastic potential energy?
This is the energy stored in objects that can be stretched or squashed
For examples when you pull back the string of a bow
What is kinetic energy?
This is the energy of a moving object
What is the conservation of energy?
This states that energy cannot be made or lost but it can change from one form to another
State examples of energy changes that occur in every day life
An electric kettle changes electrical energy into heat energy
An electric bulb changes electrical energy into light energy
A fire changes chemical energy into heat energy
Explain renewable energy
This is energy that can be used over and over again
Give examples of renewable energy
Explain non-renewable energy
This is energy that cannot be used over and over again
Give examples of non-renewable energy
What are energy transfer diagrams?
An energy transfer diagram shows the useful energy transfers taking place in a process
What is a Sankey diagram?
This shows all the energy transfers taking place in a process
It is a more accurate way of showing energy transfers
The thicker the arrow is, the more energy there is involved in the process
What is dissipation of energy?
This is when energy changes from a useful form to a not so useful form
For example when you bounce a ball it loses height on each bounce as the energy is been converted into heat in the ball
What is meant by efficiency?
This is a measure of how close we can get to 100% energy transfer in a device
What is power?
This is the rate at which energy is transferred from one form to another
What is the unit used to measure power?
What is power rating?
This is a measure of how much energy is transferred per second in a machine
What is the unit used to measure electricity?
What is the BER rating?
This shows how much energy a home uses
This is called an energy rating
The BER scale goes from A to G
A is the best rating
List ways in which we can save energy in our homes and schools
- Put laggin jackets on hot water tanks
- Insulate the attic
- Have double glazed windows
- Use carpets and curtains
- Do not leave doors and windows open
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