Electrical power can be controlled very accurately at a high efficiency by electronic means. High voltages and large currents can be switched in less than one thousandth of a second with modern semiconductor transistors. With the aid of powerful microprocessors voltages and currents are chopped and reconstructed into almost any wave shape imaginable. Power electronics makes it possible to control the speed and acceleration of the high speed trains in Europe at power levels up to 10MW, and at power levels of less than a watt it is used for the very accurate positioning system of laser discs.
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