Sources of information

1st source:

Author: www.altenergy.org

Uploading date: Septembre 2nd of 2014 

Alternative Power:

Alternative energy refers to energy sources that have no undesired consequences such for example fossil fuels or nuclear energy. Alternative energy sources are renewable and are thought to be "free" energy sources. They all have lower carbon emissions, compared to conventional energy sources. These include Biomass Energy, Wind Energy, Solar Energy,Geothermal Energy, Hydroelectric Energy sources. Combined with the use of recycling, the use of clean alternative energies such as the home use of solar power systems will help ensure man's survival into the 21st century and beyond.

Solar Energy: 

From an environmental perspective, solar power is the best thing going. A 1.5 kilowatt PV system will keep more than 110,000 pounds of carbon dioxide, the chief greenhouse gas, out of the atmosphere over the next 25 years. The same solar system will also prevent the need to burn 60,000 pounds of coal. With solar, there's no acid rain, no urban smog, no pollution of any kind.

Wind Power:

Societies have taken advantage of wind power for thousands of years. The first known use was in 5000 BC when people used sails to navigate the Nile River. Persians had already been using windmills for 400 years by 900 AD in order to pump water and grind grain. Windmills may have even been developed in China before 1 AD, but the earliest written documentation comes from 1219. Cretans were using "literally hundreds of sail-rotor windmills [to] pump water for crops and livestock."

2nd source:

Author: Gerlinda Grimes

Available on: September 4th of 2014

Scientists, researchers and advocates for green technologies are working hard to bring down these costs. Solar power has been one of the most expensive sources of alternative energy, but recent research using magnetic fields to collect solar energy without the need for expensive photovoltaic cells could dramatically reduce its costs in the future. Wind farms are another promising renewable energy resource; however, collecting and conveying the power of the wind presents an expensive obstacle. Geothermal power (energy from the heat found inside the earth's crust) seems like the perfect way to cheap, infinitely renewable power -- except for the dangerous earthquakes that might occur as a result of collecting the Earth's steam.

3rd source:

Author: http://www.greenoughsolarfarm.com.au/solar-energy/what-solar-energy and http://www.eschooltoday.com/energy/renewable-energy/wind-energy.html

Available on: September 4th of 2014

Solar Energy:

Solar energy is, simply, energy provided by the sun. This energy is in the form of solar radiation, which makes the production of solar electricity possible.

Electricity can be produced directly from photovoltaic, PV, cells. (Photovoltaic literally means “light” and “electric.”) These cells are made from materials which exhibit the “photovoltaic effect” i.e. when sunshine hits the PV cell, the photons of light excite the electrons in the cell and cause them to flow, generating electricity.

Wind Energy:

The moving air (wind) has huge amounts of kinetic energy, and this can be transferred into electrical energy using wind turbines. The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity. The electricity is sent through transmission and distribution lines to a substation, then on to homes, business and schools.