Calculating Single- and 3-Phase Parameters

Welcome to the first in a series of articles focusing on electrical calculation basics. This month, we'll discuss the most fundamental of calculations — those for current (I) and kilowatts (kW). We'll also show you how you can do these calculations “in your head,” with very reasonable accuracy, through the use of constants.

Discuss this Article 3

Anonymous (not verified)
on Feb 20, 2013

I have a boiler with no data, but I measured the phase current for each phase. The reading is 19A at 380V? How do I calculate the power?
P = 1.73 x V x I x PF =1.73 x 380 x 19 x 0.80 = 9.9kW
or
P = 1.73 x 380 x (3 x 19) x 0.80 = 29.9kW

Which is correct calculation?

Sokoun Son (not verified)
on Feb 26, 2013

That correct answer is:
P = 1.73 x V x I x PF =1.73 x 380 x 19 x 0.80 = 9.9kW

Anonymous (not verified)
on Mar 16, 2013

how will I know the ideal load on each circuit (single phase electricity?)

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