Power system voltage is converted to a very high switching, for example, is 48kV, or to reduce the size of the wire, 24kV leaders needed to power a distance of sight when you reach the destination before the power House would transform voltage levels, reduced to 220 V to reduce the harm caused to the user and to use with low voltage power level such as 9V, 6V, or must be converted from 220 V electricity according to the voltage level. A device that functions such We call it transformers (Transformer).
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