- Types:
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AC, alternating current, alternating electric current
an electric current that reverses direction sinusoidally
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DC, direct current, direct electric current
an electric current that flows in one direction steadily
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signal
an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
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interrupt
a signal that temporarily stops the execution of a program so that another procedure can be carried out
