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Measuring phase difference for square waves

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Monady

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Hi dear all friends,

I have an RC circuit, in which two parallel resistor and capacitor are connected in series with a capacitor. I want to measure dissipated power of this circuit, but I have some problem with measuring phase difference between voltage and current of voltage source (which is a square wave). Though it is so easy to find phase difference between two sinusoidal waves, I was wondering how I can measure it for two square waves.
(please take a look at the attached pic)

 

Measuring the phase difference won't help you to calculate the power. For waveform other than a sine, you have to determine the averaged product of instantaneous voltage and current.
 
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