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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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Voltage Control in a transmission line and techniques to reduce Voltage Regulation.

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What's the difference between Inverter and Non-Inverter AC? Know the whole technical analysis completely and easily.

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Difference between Inverter and Non-Inverter Air Conditioners We all have heard about these two types of ACs, Inverter AC and Non-Inverter AC. But what exactly is the difference between them. So, today in this post I am sharing the entire technical analysis of both the types of AC so that we can understand the difference easily and accurately. Once we get to know what's inside, we will be able to differentiate between them. So, let's get started...  Inverter और Non-Inverter AC के बीच अंतर || हिंदी में
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How to draw Poly-phase AC Waveforms easily and accurately? EXPLAINED

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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.  Download the session PDF here :  Download PDF
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What is Touch Potential and Step Potential? | Electrical safety 101

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Touch Potential and Step Potential Explained Electrical Safety 101
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ARCING at the circuit breaker contacts | Reasons, Risks and Remedy

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Arcing at Circuit Breaker Contacts  Reasons•Risk•Remedy Arcing is a phenomenon commonly seen whenever a circuit breaker is operated. This video describes the reason of arcing, why it is dangerous and how to stop it. Watch here
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If two coils are wound on a wooden core insulated from each other, will there be mutual inductance between them?

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Yes for small power like RF application, wooden core is used. Wood has permeability almost equal to that of air. Most of the RF applications require air core winding which removes the complexity of non-linear behavior of a magnetic core having low reluctance. That's why such a core can't be pushed into saturation and the reluctance strictly depends on mean core length (lg) and area of cross section (Ag) given by the relation Reluctance, R=lg/µAg Where µ is the permeability. Permeability simply means the ease with which magnetic flux can pass through a material. As seen, Reluctance increases with decreasing µ and vice versa, hence the reluctance called as magnetic resistance. For higher power application it is not suitable but windings which require air core can use woods (and are used to provide strength and rigidness to the windings). Here µ can be called permeability of air which is 4π×10^(-7). A good material used for core in power applications is Silicon Steels or e...
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