arvesti, kus mähiseid läbiv vool reageerib liikuvatele elementidele, tavaliselt ketastele, mis põhjustab nende pöörlemist proportsionaalselt mõõdetava energia kogusega, meter in which currents in fixed coils react with the currents induced in the conducting moving element, generally (a) disk(s), which causes their movement proportional to the energy to be measured