What equation can be used here to find the value of the capacitor?

Joshbessant2 · May 13, 2024

Hi all,

I'm struggling with these questions for this circuit as the equations I have in order to work out impedance etc all seem to need the value of the capacitor so I'm at a loss now and was wondering if there was a way to work out the capacitor value or if there was another equation I could use in order to not need it?

Thanks in advance

Avo Mk8 · May 13, 2024

How about with the values given, you work out the voltage across the resistor, and hence deduce the voltage across the capacitor.
Then you can use a formula to calculate the capacitor value from the voltage across it, the current through it, the frequency etc etc.
Not that I've done any of this for the last 55 years so Could be wrong

brianmoooore · May 13, 2024

Reading that question took me back about 50 years!

Joshbessant2 · May 16, 2024

Avo Mk8 said:
How about with the values given, you work out the voltage across the resistor, and hence deduce the voltage across the capacitor.
Then you can use a formula to calculate the capacitor value from the voltage across it, the current through it, the frequency etc etc.
Not that I've done any of this for the last 55 years so Could be wrong

Thank you, I'll give it a try