Consider a signal, f(t), with impulse samples taken N times, i.e f,f,f,...f[N-1] Let us perform FFT on it. Now, we have the amplitude on the y-axis and the frequency on the x-axis. I want to know if the unit of the quantity on the y-axis remains the same. If yes, why? If no, what happens to it?
Example: If we consider a voltage signal. What will be the unit of the quantity on y-axis after FFT of f(t)?