Download How is Energy Stored?

How is Energy Stored and
Transferred?
Emergí can be stored in a number of ways:
•In chemical substances
•In moving objects
•In hot objects
•In an object lifted up high
•In a stretched or squashed object
CHEMICAL ENERGY
• This is the energy stored in food and fuels
• This energy is released through burning or
chemical reaciton.
• E.g.
Fuel
What is the source of the chemical
energy being used here?
FOOD
By what process is the energy
released from the food?
RESPIRATION
In what forms is the energy being
released?
MOVEMENT
HEAT
The battery transfers stored
chemical energy as electrical
energy in the moving charges in
the wires.
When the fuel in a car
reacts with the oxygeb in
the air, it transfers energy to
the car so that it can do
useful work.
KINETIC ENERGY
• This is the energy that something has
when it is moving.
A skier will start at the
top of a slope. As they
move down, they
faster and gain kinetic
energy.
THERMAL ENERGY
• When a material is heated, the particles
gain energy and vibrate more.
• The material is gaining thermal energy and
it’s temperature rises.
As the particles are heated they move faster and therefore
collide more.
POTENTIAL ENERGY
• This is the name given to the stored energy
something has because of it’s position.
• It is often referred to as GRAVITATIONAL
POTENTIAL ENERGY.
Gravitational potential energy
– stored energy which can be given out if the
object falls down
Energy can be changed from
one form to another.
TRANSFER OF ENERGY
When energy is transformed from one
form to another, it is not lost.
We say it is CONSERVED.
This is because energy cannot be made
or destroyed.
What happens to the energy?
When energy is transferred, it ends up in a less
concentrated form as it gets split up into different forms
of energy:
e.g. chemical energy from candle wax would be
transferred into light and heat energy.
As the energy is less concentrated, it is now less
useful.
As energy gets less and less useful, it usually ends up
as low-level heating energy of the surroundings.
Copy the diagram at the top of p.78 and label
the energy transfers described in the text.