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There is a rotating machine that transforms electrical energy into mechanical energy. It is called a motor. These exist in many electronic gadgets, toys, and cell phones. These motors consist of a coil of wire (usully copper) and permanant magnets. When current is sent through these coils, it interacts with the magnetic field caused by the magnets, creating torque on that coil, which in turn causes it to spin. This spinning can be used as mechanical energy to power someting. An electrical motor can also be used in reverse. This is how electricity is generated. A generator is just an electrical motor in reverse. By using an engine, falling water, or steam to turn a motor, current is created inside the spinning copper coil, which can then be transmitted along a power grid.

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