What's the voltage over each component?
Mathematica, 33 bytes

So close to Pyth...

l/Tr[l={#,#2(x=100Pi*I),1/x/#3}]&amp;


This is an unnamed function, which takes R, L and C as its three arguments and returns a list of complex numbers as the result (in the required order VR, VL, VC). Example usage:

l/Tr[l={#,#2(x=100Pi*I),1/x/#3}]&amp;[1, 1, 0.00001]
(* {0.0548617 + 0.22771 I, -71.5372 + 17.2353 I, 72.4824 - 17.463 I} *)