Windmills produce electricity by electromagnetic induction, the process in which the movement of magnets in a magnetic field generates electricity. In a windmill, when wind moves the blades of the windmill that move the rotor, the rotor rotates a shaft that holds magnets in the magnetic field of the generator, generating alternating current that is sent along power lines.Know More
The Department of Energy holds that wind turbines provide an alternative and clean energy source to fossil fuels. Wind energy is abundant, renewable and one of the least expensive energy technologies. It can revitalize rural communities because wind farms are built in the country where wind is unhindered, and farmers can still plant crops on the land because the turbines do not take up much space. Windustry claims that wind energy can produce up to one-fifth of the nation's energy. The Wind Energy Foundation has stated that in 2013, Colorado generated almost 14 percent of its electricity using its 1,530 wind turbines with a total capacity of 2,332 megawatts.
According to How Stuff Works, people have been using wind energy since 3,000 B.C. in sailboats. One thousand years later, windmills came into being for grinding grain. The windmill was first used to produce electricity in the 1930s.Learn more about Electricity
A galvanometer uses movements of a coil within a magnetic field or a magnetic needle to measure or detect a small electric current. The galvanometer was the first instrument that scientists used to pick up and quantify electrical currents, and these devices were the first to locate electrical activity in the brain and heart.Full Answer >
Dynamos produce electric current by rotating a wire within a magnetic field. Another method rotates a permanent magnet around coils of wire. Both processes produce alternating current because the wire passes between two magnetic poles every half turn. A commutator can turn the alternating current into direct current pulses, a common practice in early days before alternating current became the standard.Full Answer >
According to Dictionary.com, a moving coil galvanometer is a galvanometer that is operated by an electric current flowing in a movable coil that is suspended in a magnetic field. A galvanometer is an instrument used to detect the existence of small electric currents and determine their strength.Full Answer >
Electromagnetic induction is the phenomenon of using a magnet to create, or induce, a magnetic field in a conductor while simultaneously dislodging free electrons within it. This produces a flow of current and a rising and collapsing magnetic field around the conductor, which is the opposite polarity to that of the magnet from which it was induced.Full Answer >