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Series RL Circuit Analysis using Matlab

Determine the voltage across the inductor in series RL circuit :

Let us compute the voltage across the capacitor for t≥0 using the following expression:

${{v}_{L}}(t)={{V}_{s}}{{e}^{-t/\tau }}u(t)$

Whereas the source voltage is 1V and time constant τ=L/R.

It’s time to write some code in Matlab to calculate the inductor voltage:

%RL Circuit Analysis
clear all;close all;clc
%%Circuit Parameters
R= 20; % Resistance (20 Ohm)
L= 1e-3; % Inductance (1mH)
tau= L/R; % RL Circuit Time Constant
Vs= 1; % Source Voltage (1V)
Time= 0:tau/100:3*tau; % Sampling Time
V_L= Vs.*exp(-Time./tau).*heaviside(Time);
xlabel('Time (s)')
ylabel('Amplitude (V)')


About Ahmad Faizan

Mr. Ahmed Faizan Sheikh, M.Sc. (USA), Research Fellow (USA), a member of IEEE & CIGRE, is a Fulbright Alumnus and earned his Master’s Degree in Electrical and Power Engineering from Kansas State University, USA.

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