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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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What is Pitch Factor? | Mitigation of Harmonics in an Electrical Machine...

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Harmonics is a big problem in any Electrical Machine as it affects the torque of a motor or lowers the effective Electrical power from a generator. But it can be removed effectively by taking care of a winding parameter known as "Pitch Factor". What is pitch factor and how it reduces the harmonic content in the waveform? Let's find out...
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Switching off lights for 9 mins | Grid Failure? Why & how was it managed...

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Switching off lights for 9 mins would have resulted in a blackout but Why? What's the impact of sudden unloading on Power Plants and how was it managed then? Let's find out...
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Why the 'M' and 'C' terminals of a wattmeter aren't internally connected?

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Why 'mains(M)' & 'common(C)' terminals in a Wattmeter aren't connected internally by manufacturers even though in all practical applications, these terminals are required to be connected externally for measuring power and energy consumption? Know the reasons behind it.
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Working of a Fluorescent Tube light | ट्यूबलाइट कैसे काम करता है? जानिए ...

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Working of a Fluorescent Tube Light explained in Hindi in English
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What's inside a Fluorescent Lamp Starter? Let's find out.

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So, I was repairing this old LED light which had a defect in its filter capacitor. In the meantime, I wanted to find out what happens if I connect a fluorescent lamp starter with this LED circuit in series just as it is in case of a Fluorescent Lamp? So, I broke the plastic cover and took out this actual starter inside which has a capacitor* connected in parallel to. Here's what I found.     *Note: The capacitor that you see in parallel to the starter is there to force high voltage across the bimetallic strip to make the entire process faster. In a fluorescent tube, fast starting is very much important to create a huge voltage across the lamp filaments and help it getting ignited. Video on working of a Fluorescent Lamp Tube: https://youtu.be/whMsyZmwEGU Subscribe to My YouTube Channel to get more interesting and informative videos on Electrical/Electronics Engineering. 
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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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