I combined some of the questions as some are repeating k I'm answering the questions which needs the web.
1. alternative sources of energy & natural sources of energy:
Biofuels
Any kind of fuels made from plants or animals. These include wood, wood chippings, methane from animal excrement or as a result of bacterial action and ethanol from plant materials. Lately it is ethanol that has become synonymous with the term biofuel and is in wide use in combination with gasoline in the transportation industry.
Natural Gas
Although a fossil fuel, Natural Gas is cleaner burning than gasoline, but does produce Carbon Dioxide, the main greenhouse gas. Like gasoline natural gas is a finite source, but unlike it, there is still a very plentiful supply still available. The EIA, in conjunction with the Oil and Gas Journal and World Oil publications, “estimates world proved natural gas reserves to be around 5,210.8 Tcf (Trillion cubic feet)”.
Wind Energy
One of the oldest and cleanest forms of energy and the most developed of the renewable energy sources. There is the potential for a large amount of energy to be produced from wind. The Global Wind Energy Council is forecasting that "the global wind market will grow by over 155% to reach 240 GW of total installed capacity by 2012." Unfortunately wind farms, whether onshore or off shores are unsightly, noisy and generate a lot of opposition.
Hydroelectric Power
Like wind energy, a very old and well developed energy source, but unlike wind energy its capacity for expansion is limited. Over development and unrestricted harnessing of water power can have devastating effect on the local environment and habitation areas.
2. How can electricity be produced :
Electricity generation - whether from fossil fuels, nuclear, renewable fuels, or other sources - is usually* based on the fact that "When magnets are moved near a wire, an electric current is generated in that wire."
Electricity generation - whether from fossil fuels, nuclear, renewable fuels, or other sources - is usually* based on the fact that:
Magnets plus copper wire plus motion equals electricity
"When magnets are moved near a wire, an electric current is generated in that wire."
Motor: shaft spins around, electricity is produced.
In the picture, the shaft and armature (with copper wire) spin around. The magnets are on the outside (they don't move). Electricity, at the "+" and "-" terminals, is shown in the picture as a lighting bolt.
Generator produces electricity: wind spins armature, produces electricity.
A "generator" and "motor" are essentially the same thing: what you call it depends on whether electricity is going into the unit or coming out of it.
A generator produces electricity. In a generator, something causes the shaft and armature to spin. An electric current is generated, as shown in the picture (lighting bolt).
Lots of things can be used to make a shaft spin - a pinwheel, a crank, a bicycle, a water wheel, a diesel engine, or even a jet engine. They're different sizes but it's the same general idea. It doesn't matter what's used to spin the shaft - the electricity that's produced is the same.
Motor uses electricity: electricity spins armature, spins fan.
A motor uses electricity. In a motor, the electricity comes in through wires attached to the positive (+) and negative (-) terminals. The electric current causes the armature and shaft to spin. If there's just a little current and it's a small motor, it won't do very much work (i.e. it can only spin a small fan). If it's a large motor and it's using a lot of electricity, it can do a lot of work (i.e. spin a large fan very fast; lift a very heavy load; or whatever the motor is being used for).
3. affects of generation of electricity :
Hydroelectric
Although hydropower has no air quality impacts, construction and operation of hydropower dams can significantly affect natural river systems as well as fish and wildlife populations. Assessment of the environmental impacts of a specific hydropower facility requires case-by-case review.
Although power plants are regulated by federal and state laws to protect human health and the environment, there is a wide variation of environmental impacts associated with power generation technologies.
The purpose of the following section is to give consumers a better idea of the specific ecological impacts associated with hydropower.
more on :
http://www.epa.gov/cleanenergy/energy-and-you/affect/index.html
4. what is solar energy?
Solar energy is the radiant light and heat from the Sun that has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation along with secondary solar resources such as wind and wave power, hydroelectricity and biomass account for most of the available renewable energy on Earth. Only a minuscule fraction of the available solar energy is used.
5. how is it environmental friendly :
it only uses sunlight which is environmental friendly and it reduces the usage of electricity at the same time. Solar energy could reduce the building of water dams for generating electricity.
6. solar panels are used in our school to generate electricity.
The answers that I've combined for questions like, how to create an environmental place for school, reducing usage of electricity and wastage of electricity :
Schools can have clubs such as environment team, or collaborate with environmentally companies such as Toyota Eco Youth. Students, community and house should plant more trees and reduce the usage of air conditioners, use biodegradable plastics, cut down the usage of electricity by switching off switches that are not in use, sort out rubbish as rubbish gives money :D and recycle papers, glass bottles, aluminum cans and many more... bring your own container when buying anything.
Hey you girls, if got any extra info add in too :D
