When checking the details of electrical equipment, a motorist should be aware of what is meant by voltage, current and resistance.
Voltage is measured in volts (IN), current strength (current) - in amperes (A) and resistance is in ohms' (Ohm). Vehicle voltage generally refers to the battery voltage. In this case, we are talking about a constant voltage of 12 V. The voltage value of the battery depends on its charge and on the ambient temperature. It can be from 10 to 13 V. In contrast, the voltage in the on-board network is created by the generator and is about 14 V at medium speeds.
The concept of current in automotive electrics is used quite rarely. The current strength, for example, is marked on the fuses and indicates the maximum current that can flow so that the fuse does not blow out and the current circuit does not break.
Wherever current flows, there is electrical resistance. Among other things, the resistance depends on the following factors: the cross section of the conductor, the material of the conductor, the magnitude of the current, etc. If the resistance is too high, malfunction occurs. For example, the resistance of high-voltage wires should not be too high, otherwise the spark plugs will not have a strong enough spark to ignite the fuel-air mixture, and the engine will run intermittently.