Z Diagram of Low Pass Filter

I am to draw an impedance diagram of a low pass filter comprising resistor & capacitor, and to indicate the phase angle. I am in dispute with teacher on the phase angle. Is the phase angle found by:

1) -arctan(wRC) or 2) -arctan(Xc/R) Appreciate if someone could advise which one of the above is correct.

TIA

Reply to
BIGEYE
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#1 gets the nod. Which did you pick?

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Reply to
Ross Herbert

"BIGEYE"

** Xc = 1/ wC

so Xc/R = 1/ wRC

and R/Xc = wRC

When C is small, Xc is large and in case of a LPF the phase angle ( or phase shift ) approaches zero when C is small.

Only formula 1 give zero phase for small C.

...... Phil

Reply to
Phil Allison

Reply to
BIGEYE

that is just general current in the circuit.

Reply to
Terryc

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