Page 330 - Basic Electrical Engineering

Resultant current lags the applied voltage if ϕ is –ve, and leads the voltage in

case ϕ is +ve.
Power factor of the circuit as a whole is

2. Admittance method

Concept of Admittance Method: Admittance is defined as the reciprocal of

the impedance. It is denoted by Y and is measured in unit mho or siemens.
Components of admittance:

If the circuit contains R and L, Z = R + j X ;
L
If the circuit contains R and C, Z = R − jX .
C
Considering X and X as X we can write Z = R ± jX.
C
L

Consider an impedance as given by

Z = R ± jX