Is there always a phase shift between current and voltage in an RLC circuit?

[Nikitin]

Hey. Say you have an RLC circuit with an AC supply. Then I=e^i(ωt-α). My question is: will α always exist, ie will the current always be phase-shifted compared to the voltage, as long as the impedance has an imaginary component or if the circuit is not at resonance? Does Z = |Z|*e^iα, where α = atan[im(Z)/re(Z)] ?

 

[gnurf]

Does the phasor diagram answer your question?

Source: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/rlcser.html