Safety note: High voltage is generated in the vehicle, for example in the ignition system and when using xenon lamps. Therefore, persons with a pacemaker should not perform any work on the electrical system.
When checking the electrical system, a car enthusiast always encounters such concepts as voltage, current and resistance in technical documents. Voltage is measured in volts (V), current in amperes (A) and resistance in ohms (Ohm). Voltage in relation to a car usually means the voltage of the battery. In this case, we are talking about a constant voltage of approximately 12 volts. The voltage value depends on the battery charge and the ambient temperature and can be from 10 to 13 volts. However, the on-board voltage is created by the generator, and at an average engine crankshaft speed, this voltage is approximately 14 volts. The concept of "current" in the field of automotive electrical engineering is relatively rare. The current value is indicated, for example, on fuses, and this value corresponds to the maximum current in the electrical circuit at which the fuse does not burn out and the circuit is not de-energized.
When flowing through an electrical circuit, the current must overcome resistance. Resistance depends, among other things, on factors such as the cross-section and length of the conductor, its material and electrical conductivity. If the resistance is too high, faults occur in the electrical system. For example, the resistance of high-voltage wires should not be too high, otherwise it is impossible to obtain a sufficiently strong electric spark that ignites the fuel-air mixture and thus creates the prerequisites for the operation of the gasoline engine.
Caution: Before working on the electrical system, be sure to disconnect the battery ground (-) wire. Before working, read the instructions in the chapter "Removal and installation the battery". In this case, carrying out work with the electrical equipment system also means disconnecting and connecting electrical wires at the connector locations.
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