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Energy and Energy Conservation (Renewable Energy (Wind power (A propeller…
Energy and Energy Conservation
Renewable Energy
Wind power
A propeller is attached to an electric generator and with the rotation of the propeller electrical energy is generated
This is reckoned to be one of the most user friendly methods of producing electricity
Large number are needed to created electricity known as wind farms
Wind farms must be on high ground
Solar energy
A photovoltaic cell will generate a voltage when rays of light from the sun strike it
Used generally in calculators, satellites and roof tops
Lots of cells are used together
Environmentally friendly and no toxic waste is generated
Wave/Tilde Energy
Experimentation with this form of energy is still at an early stage although some larger scale projects are in place, the Thames estuary is one example
Movement of the waves cause paddles to move up and down and this movement is converted to rotary movement that rotates the turbine blades of the electric generator
Wave energy is not yet used commercially to date but has potential, especially for island countries
It is environmentally friendly and no toxic waste is generated
Biomass Energy
Biomass energy comes from a number of biological sources
There are different sources of this type of energy including agricultural production of methane gas through to the growth and processing of willow which can then be burnt to produce steam in an electrical generating station
Willow can also be shredded and pressed into wood pellets suitable for home fuel
Hydro electric
Hydro power is an alternative way of producing electricity from the power produced by water under pressure
A typical setup requires the construction of a dam
Behind the dam water is allowed to build up forming a lake. The deeper and larger the lake, the greater potential of producing large amounts of electricity
Geothermal
Geothermal energy comes from the heat in the earth beneath the planet's surface
One way of producing electricity from geothermal energy is by drilling deep wells into geothermal reservoirs
The hot water that rises emerges at the surface as steam. The steam is used to produce electricity. If the water is not hot enough to produce steam, it can still be used to heat homes
Non Renewable Energy
Coal fired energy
Probably the most used system universally
Boilers are heated using coal and the steam produced is used to drive a turbine which in turn drives an electric generator
Harmful effects
It produces sulphur dioxide gas which in turn produces acid rain
It produces carbon dioxide (green house gas) responsible for global warming
Oil fired energy
Uses the same system as coal
Causes global warming
Nuclear energy
As the supply of fossil fuels decrease the nuclear alternative and is supposed to be the cheapest way of producing electrical energy
Produces toxic waste
Types of energy
Mechanical energy
Energy which is possessed by object due to its motion or due to its position
Two types
Potential energy
Energy due to position
Kinetic energy
Energy due to motion
Heat
Heat stored for use in the driving of steam engine or turbine
Chemical
Energy can be released by chemical combustion or burning
Sound energy
All sound are caused by vibrations which need a medium such as air to cause them to move
Electrical energy
A battery transfers stored chemical energy as charged particles called electrons, typically moving through wire
Conservation of energy
Energy transformation