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[Music] lets talk about non-linear loads in article 100 so a non-linear load is a load where the current waveform is different than the voltage waveform all right so lets start with the voltage waveform which is shown in blue this is a nice normal predictable 60 hertz sine wave where weve got one cycle right so going from zero crossing to peak to zero crossing to negative peak back to the zero crossing is one cycle it does 60 of those in one second here in the us if we look at the purple waveform however we can see that its obviously different than the voltage waveform so that means its a non-linear load so if we were to count how many cycles this neutral has compared to the voltage waveform we can see that it starts at a zero crossing peak zero crossing negative peak zero crossing and it does that one two three times for every one of our voltage waveforms so this is 180 hertz and what we would call that is a third order harmonic current all right so harmonic currents are a resul