Calculating Capacitor Impedance for Resistor Replacement in a Circuit

how to calculate the impedance of a capacitor, my point is to replace the resistor

I think the formula for high school capacitance is enough:

Quote:

$$Xc = \frac{1}{2 \pi f C}$$

of course this is a theoretical capacitor, you have to add the internal resistance and take into account that capacitors may behave differently at different frequencies.

greetings

if it is to be a real capacitor, the internal resistance should be taken into account and the impedance formula is Z = ? (R? + Xc? where R is the internal resistance and Xc is the capacitor reactance

and how to calculate r2

myncio wrote:

and how to calculate r2

I would not like to be malicious - but in math lessons you must have slept ...

as for R, you can calculate them from the formulas for Xc (he was higher) Uc = I * Xc Ur = I * RU = I * Z U? = Uc? + Ur? and Z (also above)

Gentlemen, why are you scaring a man. If this capacitor is to operate at low frequencies and, additionally, its reactance tolerance may exceed 10%, the first formula is sufficient. The rest of the parameters are of little importance.

ok, but how to calculate the internal resistance
like Z I don't have what pattern

Do you need to calculate all the real parameters of a capacitor ie apart from capacitance, resistance, inductance, and various other junk. Write what you need it for, because maybe your calculations are pointless.

I would like to replace all resistors - conden in the system but I found out that you need to calculate the impedances and I ask?

What is this deal.

For example, to regulate the rotation of commutar motors, let's say replace resistors - with capacitors
exactly that instead of resistors, give capacitors in any system
or build a circuit on capacitors

myncio wrote:

I would like to replace all resistors - condenium in the system but I found out that you need to calculate the impedances and I ask?

how can you ??? I guess I slept in lessons too

If capacitors could be inserted everywhere instead of resistors, the production of resistors would probably be abandoned. Capacitors are used instead of resistors in only one case. When a high-value alternating current flows through the resistor and the voltage drop across the resistor is significant, significant power is emitted across the resistor. Such a resistor can be replaced with a capacitor, provided that we do not mind the current and voltage shift introduced by this capacitor. We gain only that there are no power losses in the capacitor (of course, I ignore the negligible losses caused by the imperfection of the capacitor). To calculate the capacitor, the colleague's formula 12robert12 is enough.