Hi peeps~

I have a question which I am struggling with need your professional help.

I have a very simple series circuit, consisting a resistor and PZT material(I was told this can be viewed as a conductor? or capacitor I forgot..) connected using a function generator and an oscilloscope.

Say, I input 1 volt using the function generator and goes through the circuit and shows 0.8 volt on my oscilloscope. Now I need to know how to find impedance. I searched around and was told that Total impedance Z, is R*Vin / Vout.

Simple enough yes? but funny thing is that there is a phase difference between Vin and Vout, so I was told that there is a real part and an imaginary part where Vout is actually,

Vout = 0.8Cos(phase value) + j*0.8Sin(phase value)

where left one is real part and right part is imaginary part. I was wondering if this is correct? if it is correct, the impedance is usually a single value, so how can I add real and imaginary part to make into a single value...

please help a poor student out.

Cheers

Sam