Phase Angle in R, L & C

Inductors and Capacitors, or a combination of these and resistors in A.C. circuits have a phase angle - the current is out of phase with the voltage:

Resistance:

For a resistor the current and the voltage is in phase.

Inductance:

For an inductance Voltage leads Current by 90 degrees (p / 2 radians).

Capacitance:

For a capacitance Voltage lags Current by 90 degrees (p / 2 radians).