''Another order could be definitions by subject such as DC, AC, radio, integrated circuit, etc.''
Alternating current. Consists of a periodic oscillation between two different voltages. Usually said to look like a sine wave, but is not always.
Amplitude modulation. In radio communications, a signal controls the amplitude of a carrier wave that is at a much higher, constant frequency. The carrier wave is filtered out and a loudspeaker plays based on the amplitude of the signal.
Ampere (A) : The SI unit for current ''I''. (Commonly spoken as "amps", "milliamps", etc.) The ampere is officially defined as that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed one metre apart in vacuum, would produce between these conductors a force equal to 2×10<sup>-7</sup> newton per metre of length. There is another definition which is based on the deposition rate of silver (''in electrolysis?''), which is much easier to measure. The other electronics units are ''derived units'' based off of the ampere definition.