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Electrical Fundamentals – Concepts of Alternating Current

A. Bhatia, B.E.

The electricity you get from your electric outlet is alternating current (AC). There are many appliances such as computer and TVs that actually work on DC while other electrical appliances, such as refrigerators, air-conditioners, lighting etc… can be designed for both AC and DC.

Since some kinds of loads only require DC to power them and others can easily operate on either AC or DC, the question naturally arises, "Why not dispense entirely with AC and just use DC for everything?" This question is augmented by the fact that in some ways AC is harder to handle as well as to use. Nevertheless, there is a very practical reason, which overrides all other considerations for a widely distributed power grid. It all boils down to a question of cost.

This 3-hr course material provides insight to the basic concepts of alternating current and is based entirely on Naval Education and Training Materials (NAVEDTRA 14173), Electricity and Electronic Training Series; Module-2 “Concepts of Alternating Current” and covers Chapter 1.

The course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of course materials.

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