Questions in Alternating Current

Select	Question
	Which of the following components of a LCR circuit, with ac supply, dissipates energy
	In a circuit $L,\,C{\rm{ and }}R$are connected in series with an alternating voltage source of frequency $f$. The current leads the voltage by $45^o$. The value of $C$ is
	In an A.C. circuit the current
	For the series LCR circuit shown in the figure, what is the resonance frequency and the amplitude of the current at the resonating frequency