Coding Circuits in Matlab

Hello everybody,

Im just getting started with Matlab. Can someone tell me how to write a code of a Resistor for example or a small electrical circuit consisting of two in series Resistors so the plot can be done in Simulink

thx in advance!

[ABEBE]

pure resistive circuit

Answer 1

[Prasanna Konyala]

Hi Ibrahim

From my understanding, you want to create a circuit with resistors in series.

To find the equivalent resistance you can use sum() (as the sum of resisters is the equivalent resistance in series connection).

If you want to design and implement and simulate the circuits, I suggest you try Simscape Electrical toolbox. It makes the process simpler than writing whole code in Matlab.

You can leverage plot in matlab or scope in Simscape for plotting

Answer 2

[pratiksha]

% Define the symbolic variables

syms v1 v2 v3

% Given values

R1 = 1/3; % Resistance in Ohms

R2 = 1/2; % Resistance in Ohms

R3 = 1/6; % Resistance in Ohms

I1 = 4; % Current in Amps

I2 = 9; % Current in Amps

V_source = 5; % Voltage source value in Volts

% KCL equations using the supernode method

% Equation at node v1:

eq1 = (v1 - v2) / R1 == I1;

% Equation at node v3:

eq2 = (v3 - v2) / R3 == -I2;

% Supernode: Combine v2 and v3 with voltage source constraint

% Voltage constraint: v3 = v2 + V_source

eq3 = v3 == v2 + V_source;

% KCL at the supernode (combining v2 and v3):

% (v2 - v1) / R1 + v2 / R2 + (v2 - v3) / R3 = 0

eq4 = (v2 - v1) / R1 + v2 / R2 + (v2 - v3) / R3 == 0;

% Solve the equations

sol = solve([eq1, eq2, eq3, eq4], [v1, v2, v3]);

% Display the results

v1_sol = double(sol.v1);

v2_sol = double(sol.v2);

v3_sol = double(sol.v3);

fprintf('The solution for v1 is: %.2f V\n', v1_sol);

fprintf('The solution for v2 is: %.2f V\n', v2_sol);

fprintf('The solution for v3 is: %.2f V\n', v3_sol);