Ochm
Ochm is a term that appears to be a misspelling or a less common variation of "ohm". The ohm (symbol: Ω) is the SI derived unit of electrical resistance and conductance. It is named after the German physicist Georg Simon Ohm. The ohm is defined as the electrical resistance between two points of a conductor, when a constant potential difference of one volt, applied between these points, produces in this conductor a current of one ampere. In other words, 1 Ω = 1 V/A.
Electrical resistance is a measure of how difficult it is for an electric current to pass through