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When to use I²R, V²/R or VI while calculating Electric Power?

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I came across a question that was asked to me quite a couple of time: When to use I²R, V²/R or VI while calculating power? At first, the question looks simple and as if it needs no formal explanation but that's not the case. Use of any of them will give the correct result provided that you apply it correctly. Correct application is possible only when you understand the type of circuit you are dealing with. Another important point is to use the one which is going to take less time and help you calculate easily. All of the three equations tell the same thing but their usage is subject to the type of problem you're trying to solve. Let us understand when, how an what to use while calculating power in an electrical circuit.
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Corona Discharge & Corona losses in a Transmission Line.

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 *Note: Not to be confused with Coronavirus or CoVID-19...

Corona Discharge is a phenomenon that happens around a High Voltage Transmission Line in which the air surrounding the surface of the conductor glows bluish or greenish and a hissing sound is produced. Mathematically speaking, when the maximum Electric Field Intensity equals the dielectric strength of the medium around the transmission line, the voltage of the transmission line at this point is known as the Critical Disruptive Voltage. Beyond this voltage, the Corona phenomenon is seen on the line. Let's understand each of these things and what exactly is corona discharge, corona power loss and how to control it...



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