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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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Hello EEngineers!

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Hello Friends!

I am Vivek Choubey, a final year Electrical Engineering graduate student. I am starting this blog to add some of the often asked questions on Electrical Engineering which are thought provoking as well as interesting to know. We learn many topics day to day but due to intense pressure of exams or because of not minding enough on day to day topics, many loopholes and uncleared ideas left behind. I will try to add such questions/answers and topics here which are often asked/thought provoking. Please feel free to let me know your views in comment section or E-mail me at vkconline437@gmail.com . I am active on Quora too at https://quora.com/profile/Vivek-Choubey-5 . You can ask me your questions there. Some of the incredible questions and answers will be added here from other writers too with their permission.

I am also a web developer and ardent programmer. I made an HTML5 and JavaScript Simulation tool named VKC CodeBuilder which helps learners and code-testers to test their HTML5 and JavaScript,  present online at https://vkccodebuilder.neocities.org

Keep supporting, keep learning.

Thanks.
-Vivek.

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