Answer / vishal ingle

Harmonics are the integer multiple frequncy signals present
along with the fundamental frequency in a circuit. e.g.
2nd harmonic freq = 2*fundamental freq.
3rd harmonic freq = 3*fundamental freq.

Answer / ghanshyam_singh

i think the presence of current of higher frequencies in the
circuit is termed as harmonics.

Answer / anindya basu

Harmonics is nothing but a disturbance in pure sine wave line
voltage

Answer / bala

A harmonic of a wave is a component frequency of the signal that is an integer multiple of the fundamental frequency, i.e. if the fundamental frequency is f, the harmonics have frequencies 2f, 3f, 4f, . . . etc. The harmonics have the property that they are all periodic at the fundamental frequency, therefore the sum of harmonics is also periodic at that frequency. Harmonic frequencies are equally spaced by the width of the fundamental frequency and can be found by repeatedly adding that frequency. For example, if the fundamental frequency is 25 Hz, the frequencies of the harmonics are: 50 Hz, 75 Hz, 100 Hz etc.

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