In the circuit Vs = 10 cos ωt. Power drawn by the 2 ohm

Home » Network Theory » Network Elements and the Concept of Circuit » Question

In the circuit Vs = 10 cos ωt. Power drawn by the 2 ohm resistor 4 W. The power factor is—

1. 0.3
2. 0.4
3. 0.6
4. 0.8

Correct Option: C

Let I be the current I = I_m I² × 2 = 4
I = 2

Total power drawn =	1	I² R_eq =	1	× (2)² × (2 + 1)
	2		2

= 6 W
1/2 V_m I_m cos θ = 6
1/2 × 10 × 2 × cos θ = 6
cos θ = 0.6 or P.f. = 0.6