Chapter 7 Capacitor Engineering
7.1 Power according to Famous Chinese revolutionary leader mao ze tung, Power lies in the barrel of gun, but in electrical world if you are student it lies under the pen of Professor and if you are engineer it lies besides the technical / non-technical higher ups. Literally power is the product of voltage and current or better to say the scalar / Dot product of voltage and current.
P = V. I In any system the power we supply is called apparent power or total power, but we cannot use total power( although many of us want same as our politician want in Pakistan), due to system heat some of power loss in system which we called as reactive power, remaining power is called as real power. In simple words, Active / Real Power = Voltage. Real Current = VI cos angle between voltage and current Reactive Current = Voltage. Reactive Current = VI sin angle between voltage and current
1st of all remember that reactive component is necessary to cause the flux required in induction process. So whenever I need to switch on my domestic motor for water pumping, computer for Facebook, light of room etc. I have to think for not only real power I am consuming but also reactive power. Now how can I clear or differentiate this active, apparent or reactive power in my mind, I can use the terminology Power Factor.
7.2 Power Factor
Power factor is the ratio( remember we all our rational in our mind, if you not agree just think about your last time money transfer to home or buying of new mobile) between how much apparent power I got from substation / Grid station and how much I used.
Power Factor = Active Power / Real Power pg. 236