Rl Series Circuit Waveform. The total impedance of a series rl circuit similar to its total voltage is the vector sum of the resistance and inductive reactance. The time constant of an rl circuit is the equivalent inductance divided by the thévenin resistance as viewed from the terminals of the equivalent inductor.
When a square wave of voltage is applied to a series rl circuit results similar to those from rc circuits can be expected. The time constant of an rl circuit is the equivalent inductance divided by the thévenin resistance as viewed from the terminals of the equivalent inductor. The waveform and power curve of the rl series circuit is shown below.
The impedance of series rl circuit opposes the flow of alternating current.
The expression for the current in the inductor is given by. The impedance triangle for a series rl circuit is shown in figure 3. If a waveform s high time equals its low time it is called a square wave. Voltage drop v r is in phase with current vector whereas the voltage drop in inductive reactance v l leads the current vector by 90 o since current lags behind the voltage by 90 o in the purely inductive circuit.
