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[SOLVED] Power Consumption of unknown, nonlinear circuit

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HarryH00t

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Hey there,
I'm having problems calculating the power consumption of a circuit. I got an nonlinear circuit (rectifier) and want to calcutlate the instantanious power. The circuit has 2 inputs, which are conected to an AC voltage source. I can measure the current which flows into the circuit. But how can I calculate the power? The picture below shows what I can measure. Can I calculate the power with:
P = V1*I1 + V2*I2 = V(AC)*I1 - V(AC)*I2
?
thanks for your help
Harry
 

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Instantaneous power is product of current and voltage at certain time instance.

Your Pinst = V1*I1 + V2*I2 is correct (V1 = Vp, V2 = Vp_not)

As I1 = -I2 = I , this reduces to Pinst = I*(V1 - V2) = I*Vac (Vac = V1-V2)
 
Allright, thanks a lot. But this means my equation was wrong, right? (the right part must be wrong, since i was taking the whole Vac and not only the one lying on one input). I see it a lot clearer now. I1 = -I2 was a good hint, didn't see that :/
thanks again, so long
Harry
 

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