ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Induced current. Oscilloscope trace from an electric coil, showing a current flowing at the precise moment when a magnet is dropped through the coil. Electricity is generated, or induced, when a wire moves through a magnetic field. This principle is exploited in electricity generators, which spin a coil between magnets to convert rotary motion into electrical energy.
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