croc :
From your power meter's point of view, KVA and KW are the same. KVA is just a more universal way of expressing KW, as V will vary country to country, thus A as well. Still goes back to Ohm's law, P=IxE.
Yeah right! Do you understand what cos phi or power factor means? really? do you really2 sure 'bout this?
Why don't you do a little searching 'bout that in the books!
Do you understand bout how coils and capacitors can effected your power consumtion, harmonic distortion, how to deal with under value of power factor and etc. ?
Get real dude. I don't be that sure, if i were you!
Altough this time, yup ! , for home users kVA and kW didn't make much differences.
And I've made a little missprint!
It should be :
kVA = kW / cos P
Your computer consumed 600W (let asume you have a very very very very very good PSU and the power factor is 0.8)
kVA = 0.6 / 0.8 = 0.75kVA and you did have under 0.9 power factor value. In most countries, if you are a company than you have to pay an extra fee because of it but since you are a home user you don't have to pay it. This fee is not the same for every countries.
Let see what you've wasted as a company and consumed 600,000 kW instead of 600W.
kVA = 600,000 kW / 0.8 = 750,000 kVA . You'll have to pay this bill + extra fee + your power network are burdened by loses caused by low on power factor.
kVA = 600,000 kW / 0.95 = 631,579 kVA . You'll just have to pay this bill and without extra fee + your power network are not burdened by loses caused by low on power factor.
The price for the bill you've paid every months is with the calculation of kW and that goes the same to the companies, but the big big difference is in this extra fee. And this fee also came together with a warning, if you didn't fix the power factor, you are dealing with the law! not to mention the loses caused by low power factor.
You don't pay the kVA but the kW. That why i have said ''Altough this time, yup ! , for home users kVA and kW didn't make much differences.'' because you don't have to pay the extra fee. An,d you use only a little amount of power, unlike the companies.
Why or where did this power factor come from? For further details just hit the books man or ask any power electrical professors at your nearest university ! It is a very long story! And I'm not interested to give all the details here!
I'm trying to make it as simple as i can, because it is not that simple, infact it took years for somebody to learn it correctly in the university. So a lot lot lot lot lot lot of things are missing here, then it is normal and are intended to be made.
And this P = I x E can only be used if your system are consists with only resistors!
You should be carefull before you said anything and if that turned out to be wrong!