Total harmonic distortion is calculated using which of the following according to the Fourier method?

Total harmonic distortion (THD) is a quantitative measure of the harmonic distortion present in a signal, indicating how much of the signal's energy is comprised of harmonics rather than the fundamental frequency. When using the Fourier method to calculate THD, the standard procedure involves considering all harmonic components of the signal.

The correct approach for calculating THD according to the Fourier method involves taking into account all harmonics present in the waveform. This method provides a comprehensive analysis of the waveform, allowing for an accurate depiction of how much distortion exists relative to the fundamental frequency.

The simple inclusion of just the first and third, or any limited selection of harmonics, would not yield a complete or representative measure of the total harmonic distortion, as the calculation must encompass the full range of harmonics affecting the signal. Accurate measurement is essential in diagnosing issues related to waveform quality in electrical systems, which can impact efficiency and performance.

Therefore, the consideration of all harmonics allows for a complete understanding of the distortion present in a signal, making it vital for accurate analysis and reporting in electrical engineering practices.