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AC through resistor, capacitor and inductor (tabular form)

Type of circuit	Value of current	Total impedance	Remarks
R circuit	I=E/R	Z=R	Both current and emf are in phase
L circuit	I=E/XL	Z=XL=Lw	Current lags emf by π/2
C circuit	I=E/XC	Z=XC=1/Cw	Current leads emf by π/2
LR circuit	I=E/Z	Z=√(R2+XL2) where XL=Lw	In R: Both current and emf are in phaseIn L: Current lags emf by π/2 So θ=tan-1(Lw/R)
RC circuit	I=E/Z	Z=√(R2+XC2) where Xc=1/Cw	In R: Both current and emf are in phaseIn C: Current leads emf by π/2 So θ=tan-1(-1/CwR)
LCR circuit	I=E/Z	Z=√{R2+(XL-XC)2 }where Xc=1/Cw, XL=Lw	In R: Both current and emf are in phaseIn C: Current leads emf by π/2 In L: Current lags emf by π/2 So θ=tan-1{(Lw-1/Cw)/R}

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