1a

close all;
clear all;

A=230;
f=50;
t=0.1;
fs1=10000;
fs2=500;
fs3=200;

counter=1;

w=2*pi*f;

for i=0:1/fs1:t
    x1(counter)=i;
    y1(counter)=sin(w*i);
    counter=counter+1;
end

counter=1;

for i=0:1/fs2:t
    x2(counter)=i;
    y2(counter)=sin(w*i);
    counter=counter+1;
end

counter=1;

for i=0:1/fs3:t
    x3(counter)=i;
    y3(counter)=sin(w*i);
    counter=counter+1;
end


hold on

plot(x1,A*y1,'b-')
xlabel('second')
ylabel('Volt')
plot(x2,A*y2,'ro')
plot(x3,A*y3,'kx')