In a Series RLC Circuit the Rms Value of the Generator

Multiple Choice

In a series RLC circuit the rms value of the generator emf is E and the rms value of the current is i. The current lags the emf by $\phi$ . The average power supplied by the generator is given by:

A) (iE/2) cos $\phi$
B) iE
C) i²/Z
D) i²Z
E) i²R