Question

The series combination of R, L, C is connected to an a.c. source. If the resistance is 3 and the reactance is 4, the power factor of the circuit is:

Options

• 0.4

• 0.6

• 0.8

• 1.0

Answer 1

0.6

Explanation:

R = 3r and x = `4sqrt(2)`

z = `sqrt(R^2 xx X^2) = sqrt(3^2 + 4^2)` = 5

Power factor = `cos phi = R/Z = 3/5` = 0.6