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# Need Help Understanding frequencies

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#### karim1

##### Newbie level 1
Hello to u all , i have a very basic doubt which keeps on saying that "you are incomplete in understanding completely" inside me , i will really appreciate if anyone here clears it , My doubt is how multiple frequency can be passed in a single wire or actually in reality let us assume a sine wave of 50 Hz frequency , many books refer like it has so many frequency components inside it blah blah but actually there is only one signal with only one frequency right , but it is really tough for me to imagine this sine wave into a number of frequencies , it sounds very abstract to me , Kindly help me please , sorry for my poor english (if u feel so) .i know that the concept of resolving a single frequency into multiple freq is quite significant but what made them to think like this when reality shows that there is only one(correct me if im wrong), atleast tell me how to accept it and digest it into my brain, plz help

I am not sure if this will help, but on this page Square wave signals : MIXED-FREQUENCY AC SIGNALS there is a series of diagrams showing what happens if you add together various additional harmonics to a sine wave to end up with a square wave.

Keith.

let us assume a sine wave of 50 Hz frequency , many books refer like it has so many frequency components inside it
I don't think, you'll find this in a book. A sine wave isn't comprised of multiple frequency components, it's a pure signal.

Distorted sine waves or other waveforms can be represented as a superimposition of harmonic (frequency n*f0; n=1,2...) components.

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