Answer / vinodh.t

when the wave form of ac is pure sinosoidal wave than it
not contain any harmonic..but if wave distorted (not pure
sine wave) than that is if contain multipuls of fundamental
frequency component it is called harmonics ..and it cause
due to non-linear load such as thyrister controlled
rectifier etc

Answer / sridhar

multiple frequency component is a harmonic
levels of harmonic 1st>2nd>3rd>...

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