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Energy (Energy stores (Kinetic, Thermal, Chemical, Gravitational potential…
Energy
Energy stores
Kinetic
Thermal
Chemical
Gravitational potential
Elastic potential
Electrostatic
Magnetic
Nuclear
Energy transfers
Mechanical
Electrically
By heating
By radiation
Efficiency
How much energy is useful
Energy is transferred into different stores
Some of the energy produced is useful
Some energy is wasted
Reducing unwanted energy
No devices are 100% efficient
Some machines are more efficient than others
Lubrication reduces energy lost through friction
Insulation keeps heat in
Renewable energy resources
Wind power
Solar cells
Hydro electricity
Tidal barages
Energy rescources
Renewable
Don’t damage the environment that badly
Don’t create much energy
Never run out
Non renewable
Are reliable
Low costs
Slowly running out
Create environmental problems
Dangereuse waste