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We have been harnessing the wind's energy for hundreds of years. From old Holland to farms in the United States, windmills have been used for pumping water or grinding grain. Today, the windmill's modern equivalent - a wind turbine - can use the wind's energy to generate electricity.

Wind turbines, like windmills, are mounted on a tower to capture the most energy. At 100 feet (30 meters) or more aboveground, they can take advantage of the faster and less turbulent wind. Turbines catch the wind's energy with their propeller-like blades. Usually, two or three blades are mounted on a shaft to form a rotor.

A blade acts much like an airplane wing. When the wind blows, a pocket of low-pressure air forms on the downwind side of the blade. The low-pressure air pocket then pulls the blade toward it, causing the rotor to turn. This is called lift. The force of the lift is actually much stronger than the wind's force against the front side of the blade, which is called drag. The combination of lift and drag causes the rotor to spin like a propeller, and the turning shaft spins a generator to make electricity.

The wind turns the blades, which spin a shaft connected to the generator and produces electricity. Turbine blades are designed in such a way that wind causes them to rotate, which rotates the shaft at low speed, with a gear at the end that itself is connected to small gear on high speed shaft that runs through alternator housing.

he generator produces electricity using the same principle as a generator of your car (depending on the turbine). Magnetic Rotor inside the generator on high speed shaft spins inside loops of copper wire that are wound around an iron core. The rotor creates “electromagnetic induction” as it spins around the inside of the core through the coils, which generates electrical power. The current is regulated and transmission network (or home network system connection), after some changes, so it can use in our homes or sent to a battery bank for storage.

Technological developments are continually lowering the material and component cost of fuel cells and production is being ramped up and automated, allowing economies of scale to be realised.

y growing plants can be achieved by producing biofuels from

Balance between the carbon released by biofuels and carbon uptake by growing plants can be achieved by producing biofuels from feedstocks (raw materials) that come from managed forests or sustainably cultivated crops.

Then we’ll present diagrams and discuss photovoltaic solar, solar hot water, and concentrated solar power. The easiest way to think about these is: am I using solar energy to heat water (solar hot water and CSP) or am I converting sunlight directly into electricity (photovoltaic cells)? Solar Energy Diagram #1 – Insolation

Wind Energy The answer is blowin’ in the wind How is man going to keep up with increasing energy demand while the amount of available fossil fuel diminishes? The answer could be wind power, the capturing of the energy contained in gusts of wind. What is wind Energy?

Man has been using wind energy for thousands of years. Windmills, sails and even kites are all devices designed to harness the awesome power produced when the wind blows. Even modern aircraft benefit from wind power. Pilots flying westward usually expend much effort trying to make sure they place themselves in the jet stream, the hundred mile per hour wind caused by the earth spinning. Now engineers are able to convert such power into electricity, pump it into grids and provide energy for homes.

Hazardous chemicals are used in the manufacture of solar cells, creating environmental considerations in their manufacture and, in some cases, in their eventual disposal. Solar cell manufacturers minimize their use of these chemicals, recycle them when possible, and release a minimum of pollutants to the environment.

kilowatt system will replace around 2.5 tonnes of greenhouse gases, possibly more. It depends on what your annual output is, and what the local mix of power sources is in your province/state/country.

William Grove, a chemist, physicist and lawyer, is generally credited with inventing the fuel cell in 1839

n the late 1950s and early 1960s NASA, in collaboration with industrial partners, began developing fuel cell generators for manned space missions.

The construction phase involves the construction of the geothermal field(s), infrastructure, power plants, and transmission lines.

The conversion technologies from hydrothermal fluids to electricity include flash steam, dry steam, and binary-cycle power plants. Each geothermal electric system is made up of several key components including a: Production well Turbine Generator Injection well. Dry steam power plants are the simplest and oldest design, upon which the two other systems are based. They use a geothermal production well that produces fluid heated by the natural heat of the earth. The steam goes directly to a turbine, which drives a generator that produces electricity. The fluid then goes into an injection well, which is a well that is specifically drilled for the safe disposal of the geothermal fluids.

As a renewable energy, offshore wind and wave energy can provide a constant energy supply that solar and onshore wind lack, he said.

Ancient Egyptians built places to live that allowed stored energy from the sun during the day, and a heat release during the night. This kind of architecture heated homes at night while keeping the temperature low during the day. Egyptians also used the sun as part of their mummification process, using the sun to dry dead bodies. The Egyptians used a form of passive solar power. 3rd Century B.C., Greek soldiers with the help of Archimedes, focused light on a Roman fleet by using mirrors,