# harmonic

## Definitions

### General Science

### Construction

- The sinusoidal component of an
__arc voltage__ that is a multiple of the fundamental wave frequency.

### Electronics

- For a
__complex signal__, __wave__, sound, or vibration which is periodic, a component whose frequency is a whole-number multiple of the fundamental frequency. The fundamental frequency is also called fundamental component, or first harmonic. The frequency of the __second__ harmonic is twice that of the first harmonic, the third harmonic is three times the first harmonic, and so on. Any even-numbered multiple of the first harmonic is called an even harmonic, while odd-numbered multiples are called odd harmonics. Overtones are the same as harmonics, except that the first __overtone__ is the same as the second harmonic, the second overtone is the same as the third harmonic, and so on. Also called harmonic component.

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