ENERGY Energy. What is energy? Energy is the ability to move something It is measured in Joules The...
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Transcript of ENERGY Energy. What is energy? Energy is the ability to move something It is measured in Joules The...
Heat energy – when heat causes things to move
Heat causes the liquid inside a thermometer to move.
Heat causes the liquid particles to move around quicker!
Light energy – when light causes things to move!
Light makes plants to grow!The vanes inside Crookes radiometer move because of light
Sound energy – when sound makes things move!
Sound makes our ear drums vibrate!
It makes glasses smash!
It can even cause avalanches!
Magnetic energy – when magnets make things move
A magnet can move thing towards it - like nails! A crane moves cars using
magnets!
Kinetic energy - the energy that moving things have!
Wind causes sails to move Aeroplanes can move people and luggage
A rock fall can move cars, people etc
Potential energy – the energy something has because of it’s
shape or position
A spring
A wind up clock
A jack in the box
The water in a dam
A sling shot
Chemical energy – stored in materials in their chemical bonds
Chemical energy is stored in food – animals get this energy when they break down food in their bodies!
Chemical energy – stored in materials in their chemical bonds
A battery stores chemical energy
Fuels like gas, turf and coal all store chemical energy that is released when they are burned!
Electrical energy - comes from moving charges
Nuclear energy – the energy that comes from nuclear fission and
nuclear fusion
Nuclear fusion in the sun
Can you think of examples of each type of energy?
There are many different types of energy:
Heat
light
sound
kinetic
electrical
chemical
nuclear
Different types of energy
Newton's Law of conservation of energy:Energy cannot be created or destroyed But it can be changed from one form to another.
Chemical energy in food is converted to heat energy and kinetic energy by our bodies.
Energy transfer
What other energy transfers can you think of?
Potential energy in a ball is converted to kinetic energy when it falls to the ground.
bunsen burner portable torch microphone battery radio television car
chemical to heat and light
chemical to heat and light
sound to electrical
Chemical to electrical to sound and heat
electrical to sound and light and heat
chemical to kinetic and sound and heat
In all these transfers the energy is not lost, it is conserved. Energy cannot be destroyed or created.
What energy changes takes place in each device?
What is the energy transfer?
Fossils fuels are non renewable sources of energy
Non-renewable sources of energy will eventually run out and take a very long time to be made again.
Ireland has a energy problem..
• 90% of electricity we use comes from burning fossil fuels…
The disadvantages of fossil fuels:1)They are non renewable (and running out!)
2) When fossil fuels are burnt they release carbon dioxide into the air which causes global warming!
Renewable sources of energy
Biomass energy
Wave and tidal energy
Wind energy
Geothermal energy
Solar energy
Renewable energy resources will not run out because they can easily be made
• Nuclear energy is made from uranium (at the moment) which will eventually run out!
Advantages/ Disadvantages of Nuclear energy
Advantages• It releases great amounts of energy. • No greenhouse gases are released by nuclear power
plants.
Disadvantages• Releases radioactive waste which can be dangerous
to the environment if not disposed of properly.• If a nuclear accident happened it would cause a lot
of environmental damage.
Group work
• Make lists of the advantages and disadvantages of each energy source
•Evaluate the other sources of energy we could use in Ireland to make electricity
Fossil fuels
Electricity
WIND WAVES
SOLAR PANELSPLANTS ANIMALS
PLASTICSGASPETROL
TURBINES TURBINES
THE SUN
The sun is our primary source of energy!
The energy that comes from the sun is changed into lots of different types of energy that we can use!
Conserving energy
Insulate with fibreglass
Double glaze and use thick curtains
Use draught excluders
Use thick carpets
Fit walls with air cavities
Energy Conservation (Saving energy)