# Is there an example of fft where on the y axis wouldn't be power? [duplicate]

my question is the same as in title. Is there an example of signal which after fft operation wouldn't have power on the it's y axis?

• Plenty of examples. For instance you can FFT daily fatality rates to see if there is any annual or weekly periodicity, etc. Jun 17 at 4:20

Pretty much all of them. For the discrete case the Fourier Transform has the same units as the time domain quantity. For the time continuous case it adds $$1/Hz$$ since it's spectral density. So if your time domain signal is a voltage the units of the Fourier Transform would also be $$V$$ for the discrete case (which includes the FFT) and $$V/Hz$$ for the continuous case.