In areas where due to infrastructure and economic problems power supply is not constant or it is not possible to access the grid, backup or portable systems are used.
Renewable sources include solar, ocean, geothermal energy, and biomass. Because their sources are limited, they are called non-renewable sources. Fossil fuels are fuels excavated from the earth, such as petroleum, natural gas, or coal. Steam is created by burning fossil fuels or from nuclear reactions. Mechanical power includes energy generated by turbines that are moved by water, steam, hot gas, or air. Niagara Falls, Ontario, CanadaĮlectricity can be generated from mechanical, thermal, and other forms of energy. Pylons near Sir Adam Beck Hydroelectric Power Station. One of the reasons that electric energy was chosen as the primary energy source for households and the industry is that it is easy to transport over long distances using power lines, and the losses are minimal. This is especially true for generation of power that heavily relies on expensive technology, or technology that requires constant monitoring and safety measures, such as nuclear, wave, or wind power.
Occasionally large industrial facilities generate their own energy, but more commonly energy production is generally done in power stations on the industrial scale, because it is not logistically or economically feasible to do that in every household. The main principle behind power generation is to convert energy to the kind easy to transport and to use (mostly electricity). The first power plants generated electricity from coal and hydroelectric power, but eventually other sources appeared, such as petroleum, natural gas, solar, and wind energy sources. Electric power is generated by batteries or electric generators. Electric power is the speed of energy transfer within the electric circuit. Some of the currently used renewable energy technologies generate wind, solar, and wave energy, among others.Įnergy generated for industrial and home use is generally converted into electric energy. A large number of research projects is focused on finding renewable energy. In recent years renewable energy, or energy from sources that can be renewed by human technology, is on the agenda of most governments and many international organizations such as the UN. Examples of such fuels are coal, oil, and uranium, used to produce nuclear energy. This means that they are from fuels mined from the Earth, and their source is not being replaced at a speed fast enough to meet the oncoming demand. Currently, the primary sources of energy are non-renewable. As more and more people use technology like cars and computers in everyday life, the demand for energy is constantly increasing. For example, the kinetic energy of moving water was used for many centuries to move water mills that produce flour. Humans have used this principle to accomplish numerous difficult tasks with the help of various devices and machines. Potential and kinetic energy can be used to perform work, such as putting objects in motion. The stone in the example above has the changing amounts of potential and kinetic energy throughout its fall, but the sum of the two is constant, because kinetic energy converts to potential energy, and vice versa. The law of energy conservation states that the total amount of energy in an isolated system stays constant. Eventually kinetic energy reaches the maximum at the moment of impact with the Earth, when the stone stops moving. The stone then falls down, and as it accelerates, kinetic energy increases, while the potential energy decreases. Eventually the potential energy peaks when the stone stops flying up. For example, when a stone is thrown directly up, as it flies and slows down, kinetic energy is converted to potential. When the body is in motion, it has both potential and kinetic energy, and kinetic energy converts to the potential one or vice versa. Once it bounces off the racket and is moving away, it has kinetic energy. At that moment it has potential energy, but not kinetic.
Niagara Falls, Ontario, Canadaįor example, when a tennis ball is hit by a racket and stops momentarily, the forces acting upon it (like gravity and the resistance of the racket), make it stay still in that position. Sir Adam Beck Hydroelectric Power Station.
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