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alternating current (AC) An electric current in which the flow reverses periodically.  
amp (ampere) A unit of electric current. 120-200 amps in a typical house circuit carries 15 to 50 amps.  
amplifer In electronics, a device that takes a small electric signal and converst it into a large one.  
amplitude modulation (AM) A type of radio signal in which the amplitude, or strength, of a RadioWave is varied in order to carry information from a transmitter to a receiver.  
analog signal A signal in which some feature increases and decreases in the same way as the thing being transmitted.  

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