(a) Harmonic Factor of $n^{th}$ Harmonic $(HF_n)$: The harmonic factor is a measure of the individual harmonic contribution in the output voltage of an inverter.

It is defined as the ratio of the rms voltage of a particular harmonic component to the rms value of fundamental component.

$$\therefore \quad \mathrm{HF}_{n}=\frac{E_{n_{\mathrm{rms}}}}{E_{1_\mathrm{rms}}}$$ …