Electrical power loss occurs due to the fact that in order for a device to operate, it must consume energy. Say for example a simple conductor, its purpose is to transport electrical current from one point to another and because of its intrinsic property(resistance) it is unavoidable for it to not dissipate some small amount of energy.
The figure below shows a simple illustration on how power loss occurs. The source is trying to deliver power to the load through the use of a wire. Since this wire has an internal resistance, it therefore tries to restrain the flow of current resulting to a use of power. This power is considered to be an "electrical loss" since the small energy used in the wire was exhausted for no significant purpose. The loss in the conductor can be computed by using this basic electrical principle; the power exhausted is equal to the square of the current that passes through multiply by the resistance of the conductor.
Ploss = I^2 X R.
The above illustration is not only limited to wires, this can also represent some other electrical devices. One good example of which is the transformer where the wire resistance in the figure can represent the winding resistance of the transformer along with its transformer core.
Again, Electrical Loss is simply the difference between the electrical energy applied and the electrical energy that was actually utilized. This explanation would be our core foundation in understanding what losses is all about.
In the succeeding topics we will discuss some detailed information concerning system's loss analysis.
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