Impedance is found using reactive impedance formulas:

For inductance, XL = 2πFL
For capacitance. XC = 1/2πFC

Where:

XL is inductive reactance, in ohms
XC is capacitive reactance, in ohms
F is frequency, in Hertz
L is inductance in Henries (so mH is H x 10 -3)
C is capacitance in Farads (so uF is F x 10 -6)

This will tell you the impedance of your coils and caps.

If you know the voltage across a component and its impedance, you can calculate the power dissipated by the device using the formula P=E2/Z. If you know the current flowing through a device, you can find power by using P=I2Z. So find the reactive impedance of the device in question at the desired frequency, and substitute that for "Z."