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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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Why does Ferranti Effect happen in a Transmission Line? Explained Simply.

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Ferranti Effect is seen in a long or medium distance Transmission line. When a transmission line is unloaded at the receiving end or is lightly loaded then it results in sudden swing of the receiving end voltage and that goes beyond the sending end voltage. This is called Ferranti Effect. 

But what exactly causes the Ferranti Effect to take place? Why does the voltage at the recieving end swings to a value greater than the sending end voltage? Let's understand that simply with the help of a mathematical model of a Transmission line. 




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