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Electrical energy can be converted into a variety of different types of energy, including light energy, mechanical energy, and thermal energy.
In a useable form, electric energy can be found in nature for free. Thunderstorms are the most relevant and prevalent expression of this phenomenon. Electricity has no direct biological utility for humans, save in extremely specific instances, such as the use of currents in medicine (electro-convulsive therapy), which is typically unpleasant and even harmful depending on the conditions.
However, it is one of the most commonly used, having been applied to a wide range of processes and devices, owing to its cleanliness and ease of generation, transportation, and conversion into other kinds of energy. To balance out all of these advantages, we must emphasize the difficulty of direct storage in accumulators.
Electric power generation is accomplished using a variety of methods. A rotary movement is used to generate direct current in a dynamo or alternating current in an alternator by those who supply the most amounts and powers of electricity.
The rotating motion is caused by either a direct mechanical energy source, such as the current of a waterfall or the wind, or a thermodynamic cycle. In the latter situation, a fluid is heated and forced to circulate via a circuit that houses an engine or turbine. This process generates heat by the combustion of fossil fuels, nuclear reactions, and other methods.
Electrical energy creation is a fundamental human activity because it is directly tied to man's current needs. All forms of energy use, including traditional and so-called alternative or unconventional ones, have a greater or lower influence on the environment, with electrical energy being one of the least harmful.