Page 324 - Basic Electrical Engineering

the phasor diagram of Fig. 3.26.

(b) When X < X C
L

The circuit will effectively be capacitive in nature. When X < X ,
C
L
obviously, IX , i.e., V is less than IX , i.e., V . So the resultant of V and
C
C
L
L
L
V will be directed towards V . Current I will lead (V – V ). The phasor
L
C
C
C
sum of V and (V – V gives the resultant supply voltage V. This is shown
L)
R
C
in Fig. 3.27.

Figure 3.27 Phasor diagram of an R–L–C series circuit when X < X C
L

Applied voltage represented by OB

or, V = IZ

where