I heard on the radio this morning that a jiffy is equal to a power cycle period at 50 or 60 Hz, among other definitions. Completely new to me. Web searches take me to http://www.numericana.com/answer/units.htm#jiffy where it suggests the more modern electrical engineering definition is 10 ms, but with no source given. Before I email Fred Berman, Ph.D., P.E. asking him for his source, I thought I'd ask here. Anyone hear of these definitions, and if so, where?
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