I want to know current and voltage of a matching circuit

[LM21]

I have a impedance matching circuit of a transistor amplifier, How can I calculate current and voltage of each component. I think I could start from power and reactance, and solve U*U/XL=P and U*U/Xc=P. Is that all, what about for instance the circuit Q.

I attach a simple output matching circuit for VHF and 4W, for an example, but there are plenty of circuits and powers.

[yl3akb]

These formulas cant be used like that. The power source must be converted to voltage source with series resistor and then standard AC circuit theory applied. See example 2.1. calculation here: https://wiki.math.ntnu.no/_media/tma4120/2021h/forkurs/ex_circuits.pdf

But yf You are lazy (like me), just use circuit simulator, lieke LTspice.

[TimFox]

I would also use a Spice analysis, using the ".AC" mode in regular Spice.
.AC mode is just a convenient analysis of the algebra, and is useful for either true linear models or linearized models.
Note that each reactance has a parasitic component (series inductance parasite for capacitors, shunt capacitance parasite for inductors), where the parasites are not exactly independent of frequency.
The parasitic resistance for each reactance (ESR) does depend on frequency.
However, the Spice analysis with reasonable models for each branch should work well for a narrowband calculation.

[RoGeorge]

If you need only the numerical values (and you don't need to know how to solve that manually, on paper), then use a simulator, e.g.:  LTspice, QucsStudio, QUCS, TINA-TI, etc. all free and can solve the posted example.

QUCS and QucsStudio have some extra RF goodies, like Smith chart representation, PCB structures calculator, RF filters design, etc.  LTspice is probably the easiest to use.  QucsStudio has dragging sliders (called Tune), in case you want to see live what happens when a component value varies.