# 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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