Question

According to given data ;

frequency = 100 hz , w(angular frequency)=2pi*f , Im= 2A, Vm= 4V , Qi=3 (degree) , Qv=38(degree)

Can you plot instantaneous voltage, current and power ; v(t), i(t), p(t) by using Matlap in the same graph with different colors?

Answer 1

MATLAB Code:

clc;
clear all;
f=100; %frequency
W=2*pi*f; %Angular frequency in rad/sec
Vm=4; %Voltage maximum
Im=2; %Current maximum
teta_v=38; %Voltage angle in degrees
teta_i=3; %Current angle in degrees
t=0:0.0001:0.05; %time vector
for i=1:1:length(t) %For loop for all time values
%As sin function takes variables in radians, voltage and current angles in degrees are converted to radians by multiplying with 180/pi
V(i)=Vm*sin(W*t(i)+teta_v*(180/pi)); %Instantaneous voltage calculation at each time value
I(i)=Im*sin(W*t(i)+teta_i*(180/pi)); %Instantaneous current calculation at each time value
P(i)=V(i)*I(i); %Instantaneous power calculation at each time value
end
plot(t,V,"red",'DisplayName','Voltage')
%plot(t,(Ang(i,:)-Ang(sbr,:))*(180/pi),['delta(' num2str(i) ')']);
xlabel("Time in sec");
ylabel("Instantaneous Values");
legend('show')
hold on;
grid on;
plot(t,I,"blue",'DisplayName','Current')
plot(t,P,"green",'DisplayName','Power')

Results:

**Here, type of the waveform is not mentioned whether it is sin or cos. For explanation sine wave is taken. If it is required to change it to cos, replace sin with cos in code.