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How an Old Speaker Generates Electricity

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A simple generator experiment can be made using an old AC motor and strong permanent magnets. When the motor shaft is rotated (by hand, wind, or another mechanical source), the internal copper coils cut through the magnetic field created by the magnets. This movement induces an electric current through electromagnetic induction. The AC motor effectively works in reverse—as a generator—producing electrical voltage at its terminals. The output can be measured with a multimeter or used to power sma

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