An equivalent circuit refers to a theoretical circuit that maintains all of the electrical characteristics of a given circuit. It proves to be quite useful for making quantitative predictions about the behavior of the induction machine, under various operating conditions. Usually, an equivalent circuit is required to simplify more complex circuit in order to aid analysis. Usually equivalent circuits consist of linear elements;
however complex circuits have non linear behavior.
however complex circuits have non linear behavior.
The equivalent circuit shown above depicts electrical activity of a quartz crystal unit operating at its natural resonant frequency. The CO, or shunt capacitance, represents the capacitance of the crystal electrodes plus the capacitance of the holder and leads. R1, C1, and L1 compose the "motional arm" of the crystal, and are referred to as the motional parameters. The motional inductance (L1) represents the vibrating mass of the crystal unit. The motional capacitance (C1) represents the elasticity of the quartz, and the resistance (R1), represents bulk losses occurring within the quartz.
