可變電阻器
Rheostat \Rhe"o*stat\, n. [Gr. "rei^n + stato`s standing still.] (Elec.) A contrivance for adjusting or regulating the strength of electrical currents, operating usually by the intercalation of resistance which can be varied at will. --Wheatstone. --{Rhe`o*stat"ic}, a.
rheostat n : resistor for regulating current [syn: {variable resistor}]