A History of Short Words

From the New York Times Crossword Puzzle

OHM

Wed, 18 May '22
One volt divided by one ampere
Mon, 14 Mar '22
Unit of resistance
Sat, 6 Nov '21
Reciprocal of a siemens
Wed, 7 Jul '21
Electrical resistance unit
Sun, 28 Mar '21
Piece de resistance?