Page 362 - Basic Electrical Engineering

Power factor

−1
power factor angle ϕ = cos 0.9 = 25°

Since the line current I is lagging the voltage V by 25°, the power factor is

mentioned as lagging. The students should note that while mentioning power
factor, it is essential to indicate whether the same is lagging or leading.

Power consumed, P = VI cos ϕ = 230 × 17 × 0.9 = 3519 W

Example 3.23 For the circuit shown in Fig. 3.52 calculate the total current

drawn from the supply. Also calculate the power and power factor of the
circuit.

Figure 3.52

Solution:

For branch I, the impedance Z is calculated as
1