Total harmonic distortion is defined as:
1
The ratio of fundamental rms output voltage to the total rms output voltage.
2
The ration of rms value of fundamental component to the rms value of all the harmonic component
3
The ratio of rms value of all the harmonic components to the rms value of fundamental component
4
The ratio of rms value of nth harmonic voltage component to the rms value of fundamental voltage component
5
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