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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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Working of Ignition System in an Internal Combustion Engine

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IC Engine or Internal Combustion Engine is the type of Engine used in automobiles. This engine detonates the air-fuel mixture inside a cylinder and the energy thus produced is converted into mechanical energy that exerts thrust on a piston inside the Engine Cylinder causing the rotation of the wheel connected or cranking. The detonation of the pressurized air-fuel mixture is done by a spark generated in the spark plug . The ignition system is an Electro-mechanical Time Controlled System that helps in accurate and adequate spark generation at the spark-plug gap. Let's understand how exactly this ignition system works and what is its working principle. A very interesting topic indeed!
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