Olin wrote:
>> Yeah, who/what can be trusted at all anymore? I put my sine
>> generator to the cap marked 220 thru a 10K [5%] resistor, and
>> adjusted freq until the voltage across the cap dropped to 50%
>> on the scope. Using Xc = 1/(2*pi*F*C)
>
>That's the magnitude of the impedance, but is not valid the way you used it
>due to being 90 degrees out of phase with the resistor.
>


Thank you - as was also brought to my attention by RichO.

[I am now limping off into the sunset on my single living brain
cell].

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