Resistance unit (3)

I believe the answer is:
ohm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">resistance unit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(ohm is the unit of electrical resistance)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ohm that I've seen before include "SI unit of electrical resistance" , "Unit of electrical resistance (3)" , "Physicist" , "lawmaker" , "A little resistance" .)