Thread: Impedance equation

Hi guys,

i need some help please with the following equation, I need to make c the subject of z=sqrt(r^2 + (xl - xc)^2).

My first step was remove the sqrt to become z^2=r^2 + (xl - xc)^2
Then expand the brackets so z^2=r^2 + (xl - Xc)(Xl -Xc)
then Multiply out the brackets so z^2 = r^2 + xl^2 - xc^2 - 2xlxc

then I'm a bit stuck where to go from there. I could move the r^2 to the other side but I'm still none the wiser on getting c as the subject.

i was also given xl= 2(pi)fl and xc = 1/ 2(pi)FC

z=104ohms r=100ohms f=50hz, l= 0.1 henry

any enlightenment would be greatly appreciated!

thanks

kris

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Hi skeeter

Thanks for the input but how do I transpose so C is the subject? Both of the above still with have xc or a c on the both sides. Sorry for not understanding and I'm sure you correct it's just that I still don to now how to use the formula by your solution

Thanks,

Kris.

Ok I get how c equals that now but the question I've been given is calculated the value of c, but how is the value of c supposed t o be calculated if I'm only given z=104 ohms, R= 100 ohms, f = 50 hz, l = 0.1 Henry. It's just throwing me as I can input the values but I still don't know xc.

thanks

Double post sorry