ABSTRACT
Equation (3) shows that at balance the products of the impedances of opposite arms of the bridge are equal. If in polar form, Z1=|Z1|∠α1, Z2=|Z2|∠α2, Z3=|Z3|∠α3, and Z4=|Z4|∠α4, then from equation (3), (|Z1|∠α1)(|Z3|∠α3) = (|Z2|∠α2)(|Z4|∠α4), which shows that there are two conditions to be satisfied simultaneously for balance in an a.c. bridge, i.e.
