CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Capacitor, electronic components and wires assembled on a circuit board. A capacitor stores electrical charge. It has two terminals (electrodes) that connect to two metal plates separated by a dielectric (non-conducting material). Capacitors are used in electronic devices to couple signals between stages of amplifiers, in electric filters and tuned circuits, or to smooth rectified current in a power supply.
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