Is Phase difference between V and I same as it is between R and X.

[zoulzubazz]

Is Phase difference between V and I same angle between R and Z??

hello guys,

this is really elementary, assuming a RC series circuit, is the phase difference between voltage and current across the impedance same as the angle between the resistance(of the resistor) and impedance (of the RC combination)?? a brief explanation would be really helpful. thanks very much in advance.cheers.

 

[BradtheRad]

Current readings match everywhere in the loop.

Resistor voltage indicates current around loop.

Resistor voltage leads source voltage. Current leads source voltage. The lower the frequency the greater it leads. Maximum is 90 deg theoretical.

Capacitor charge always lags 90 deg. behind resistor voltage.

Per diagram:

 

[Sloth]

Hi,

[edit: I initially disagreed with BradTheRad, but noticed that he is right afterall]

To original question:

Try making a simple calculation with the circuit. Or simulate with simple values. You'll notice that the total impedance angle of R and C will equal to phase angle of voltage and current. Capacitor only adds reactive component and resistor adds resistive component. Their combination will determine the phase angle.

 

[KerimF]

Hi Sloth,

Resistor voltage leads source voltage

For the circuit on post#2, isn't it equivalent to "Loop current leads source voltage"?

Kerim

 

[Sloth]

After thinking it again: Source voltage is also equal to the sum of capacitor and resistor voltage Vc + Vr. Current through C and voltage over R are in phase. So with high dV/dt, the voltage over R is higher. I just had a brainfart.

 

[KerimF]

I just had a brainfart.

Not as many I use to have

 

[cleveryj]

Phase difference between V and I is the reverse-factor in R and X of the entire circuit.
Phase(V/I) = Phase(X/R)!!