an instrument that uses the interaction between the magnetic fields produced by the currents in two coils or sets of coils to measure current, voltage, or power.
e·lec·tro·dy·na·mom·e·ter (ĭ-lěk'trō-dī'nə-mŏm'ĭ-tər) n. An instrument that measures electric current by indicating the level of magnetic attraction or repulsion between a fixed and a movable coil, one of which carries the current to be measured.