potentiometer
noun [ C ] physics, electronics specialized uk/pə.ten.ʃiˈɒm.ɪ.tər/ us/pə.ten.ʃiˈɑː.mə.t̬ɚ/
电势计，电位计，电位器
an instrument for measuring electromotive force (= a difference in electric potential)
分压器
a resistor (= part of an electrical circuit that produces a resistance to the flow of current) that has three terminals (= points of connection)