Question

what is transient current? state briefly.

Answer 1

Current before reaching steady state is known as transient current. In steady state current and voltage becomes constant, but in transient state they changes and tends to constant steady value.

Take example of ‘Charging a capacitor’. Key is pressed at t=0. Current is shown using dot(.) plot. In t= infinity (after sufficient large time) current becomes zero and remain zero, which is steady state. Before it current starts from Vb/R, decreases and tends to zero, which is transient state. So, we can consider current from t=0 to t=4RC as transient current.

Answer 2

). A transient in an electric circuit is a phenomenon that occurs during a transition from one circuit condition to another that differs from the initial condition in the amplitude, phase, shape, or frequency of the voltage acting in the circuit, the values of the parameters, or the configuration of the circuit. Transients occur chiefly when circuit elements are switched into or out of the circuit. The transients arise because the current flowing through an inductance and the voltage across a capacitance cannot be altered abruptly—that is, the energy of the electric and magnetic fields in the circuit’s capacitive and inductive elements cannot be changed instantaneously