Why we use cosine angle for calculating power factor not in sine angle ?

Why we use cosine angle for calculating power factor not in
sine angle ?

Question Posted / md.mostafizur rahman

4 Answers
15931 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Why we use cosine angle for calculating power factor not in sine angle ?..

See its because when there is no power lag, that is when the phase shift is 0 your other parameters shouldn't affect by the cos (phi). So when Phi=0 then cos (phi)=1. Therefore its much convenient to choose cosine rather than sine angles.

Is This Answer Correct ?

12 Yes

2 No

Why we use cosine angle for calculating power factor not in sine angle ?..

Answer / sanjana singh

Literally watt power factor means the factor of real use full power that is going to transmit from the total apparent power produced so that is why it is the ratio of real power to complex power which can b taken as cosine of angle ratio from power triangle. It is the reason why power factor is cos theta.

Is This Answer Correct ?

1 Yes

4 No

Why we use cosine angle for calculating power factor not in sine angle ?..

Answer / k.prakashchandra

Examine the power triangle.The adjacent side (active power)
divided by hypotenuse( apparent power) is cos of the
angle.If you multiply apparent power by sine of the angle
you get reactive power.

Is This Answer Correct ?

1 Yes

6 No

Why we use cosine angle for calculating power factor not in sine angle ?..

Answer / k.prakashchandra

pf = active (real)power/apparent power.In the power triangle
adjacent side is active power and hypotenuse is apparent
power.

Is This Answer Correct ?

1 Yes

8 No

Post New Answer

More Electrical Engineering Interview Questions

working principle of induction motor is similar to transformer. but what makes it to rotate? then why the transformer doesnt?

4 Answers

How we do the maintenance of Servo motor, even we cant open it?

0 Answers ITC Infotech,

Do anyone know how can I calculate earthing for substation or do anyone know any software which I can use for this case

1 Answers

IF we have 500kva transformer & know the current on HT & LT side, how can we consider for its breaker?

5 Answers

What is the technical formula to calculate the load taken by a motor in Amperes ?

2 Answers

PLEASE INFORM ABOUT THE IDEAL TEST RESULTS OF MAGNETIC BALANCE TEST OF TRANSFORMER 33/11 kv DELTA-STAR T/F

0 Answers

why inuctive drop is not consider in DC MOTOR

2 Answers

what is ment by doublefield revolving theory?

2 Answers

Can I use 1 phase power supply to run 3 phase motor? If yes, how?

6 Answers

Why derivative controller is not used in control systems?

0 Answers

How i can decide that HVDC line is best for transmission.

0 Answers

could anybody able 2 send me jindal steels previous papers fr electrical steam....pls send 2 my id if possible....sirisha.shaik@gmail.com

0 Answers

For more Electrical Engineering Interview Questions Click Here