Deutsche Version 
Inductive reactance X_{L} = 2 · π · f · L
Capacitive reactance X_{C} = 1 / (2 · π · f · C)
Resonant frequency f_{0} = 1 / (2 · π ·√(L · C))
Capacitive reactance calculator X_{C}
A typical question: "How to measure the inductance of a coil?" http://lmgtfy.com/?q=How+to+measure+inductance? A typical question: "How to measure the capacitance of a capacitor?" http://lmgtfy.com/?q=How+to+measure+capacitance? 

Apparent resistance (impedance):
Impedance Z = √ (electrical reactance X)² + (effective resistance R)². Apparent power S = √ (reactive Q^{2} + real power P^{2}). 
Real power P in watts Reactive Power Q in voltamps reactive (VAR) Apparent power (complex power) S in (VA) voltamps S = √ (Q² + P²) = √ (reactive power²+ real power²) 
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