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Thread: Power Factor
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16th Oct 2020, 07:48 AM #46Pink 10EE owner
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I was under the understanding that volts times amps gives you watts. Not volt amps. It is the reason why you do not pay for reactive power, because it is more difficult to measure, because of electricity is being returned to the source, that would cancel out the same quantity of electricity going to the load.
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16th Oct 2020, 07:44 PM #47
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16th Oct 2020, 09:58 PM #48Senior Member
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Putting BaronJ's reply another way ......
Apparent Power is called just that because the calculation does not contain only Watts. It also contains a component that relates to the "reactive power." Remember "Watts" is a way of saying "work" - like horsepower, where one form of energy is converted to another form. Remember, energy can neither be created or destroyed - except in an nuclear reaction.
With a reactive load not all of the electric current entering the load is converted to another form of energy.
If the load was a pure resistor, which is what an incandescent light globe is (pretty well), you could say that the Real Power (Watts) and the "Apparent Power" are the same, and the calculation is the same, and would yield the same answer.
But not all loads are purely resistive, and this is where the "Apparent Power" and "Watts" calculations differ in the result they yield.
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17th Oct 2020, 03:37 AM #49
Hi AJ, Guys,
Thanks for that explanation, you put it far better than I !
Its a lot of years past since I did any of this at Uni, I confess up front that I hated the maths but it was something that you/I had to do to get through. I got my BSc but it was a struggle !Best Regards:
Baron J.
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