Electricity Generation Explained-freyja

Home-and-Family Although humans have been aware of electricity in one form or another for thousands of years, it has only been in the last two hundred that we have been able to harness it safely and generate a steady current of it for use in electrical appliances. Instead, this type of electricity has to be generated using a primary energy source such as fossil fuels, nuclear fission, or wind power to provide sufficient kinetic energy to drive an electricity generator. Thus, electricity is usually referred to as being a secondary energy source. Before the advent of electricity generation in the late 1800s, the lighting, heating, and refrigeration needs of the typical household were met by using gas lamps, coal or wood-burning stoves, and ice-boxes. Although humans had been aware of the existence of electricity for thousands of years, it was not until the 1800s that practical ways were found to generate it and use it. Once safer, more powerful and more flexible electrical replacements for these devices came along, such as electric lights and fridges, these primary devices became a lot less popular, which created a huge demand for electricity generation. The principle behind the modern electric generator is still the same as that pioneered by Michael Faraday in the 1830s, when he discovered that turning a magnet inside a coil of wire induced a current in the wire. It was not until the far more powerful electromagnet came on the scene later in the 19th century that large scale electrical generation based upon this principle could be.e a workable reality. A typical generator consists of a series of insulated coils of wire, forming a stationary cylinder around a rotating electromagnet. As the magnet rotates, a small current is induced in each section of the wire coil, which, when .bined with the currents from all the other wires, forms one large current that feeds a flow of electrons directly into the electrical grid. These giant electromagnets are not going to rotate themselves, however, and require the energy for movement to .e from a secondary source such as a steam turbine or a windmill. Typically, a power plant can achieve an energy efficiency of around 35%, meaning that only just over a third of the energy used to create the electricity is actually turned into electrical energy. The majority of power stations use turbines, which are essentially large water wheels that are propelled by jets of steam produced by heating water with coal, gas, petrol, or nuclear power. About the Author: 相关的主题文章: