S-class W202 Mercedes

1993-2000 of release

Repair and car operation

At electric equipment check in technical documentation the owner of the car faces concepts "tension, a current and resistance".

Tension is measured in Volts (V), a current – in Amperes (And) and resistance – in Ohms (R). In the car tension, as a rule, is meant concept tension of the storage battery. Thus it is a question of tension of a direct current about 12 V.Velichina of tension of the storage battery depending on degree of its razryazhennost and from temperature of external air can make 10–13 Century. On the other hand, tension developed by the generator for an onboard network at average frequency of rotation of a shaft of the engine makes about 14 Century.

The concept "current" rather seldom meets in the field of car power supply. The current is specified, for example, on a reverse side of safety locks and specifies the maximum current which can proceed without a peregoraniye of safety locks and, therefore, without a rupture of an electric chain. Everywhere, where the current proceeds, it should be shunted by resistance. Resistance, among other things, depends on the following factors: cross-section section of a wire, material of a wire, current consumption, etc. If resistance too big, there are functional violations. For example, resistance of wires of a high voltage should not be too high, otherwise force of sparks on spark plugs which ignite a toplivovozdushny mix sufficiently decreases and, therefore, start the engine.