Physical quantities in electrics and delivery of goods

There are a lot of different physical quantities in electrics, with the help of which they calculate and perform various engineering electrical work. For a simple person who needs to do minimal work, you do not need to know everything, it is enough to know the main thing. For example, what are the types of current?

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They are of two types: constant and alternating. Constant is obtained chemically, such as in a battery or battery. This current does not change its direction and moves unchanged, which cannot be said about alternating current. A variable current is produced using electromagnetic induction. A variable current, unlike the constant, changes its direction all the time, as well as the pole. At home, only alternating current is used, a permanent is needed at the enterprise, where there are sufficiently powerful devices that cannot work on alternating current.

It is very important for any person who wants to do electrical work to know some formulas and symbols. For example, the current strength is indicated by the English letter I. Resistance is usually known as the English R. And power is denoted by the letter P.