What are the power sources in automobile circuits?

There are two power sources in the car, one is the battery and the other is the on-board generator. The main function of the battery is to start the engine and store the electric energy generated by the generator. If the car has started, the generator generates electricity. If the battery is removed from the car, the car will not stall.

Low voltage DC.

Cars use low-voltage electricity. General automobile 12V power supply, and 24V power supply for large loan vehicles. As long as it does not exceed 36V, it is low voltage. Even if you encounter such a force, the human body will not feel it. In addition, cars use DC power, and its flow direction is unchanged.

The negative electrode is grounded and the single wire is looped.

As long as the metal on the car can conduct electricity, it is the negative pole, that is, the whole car body is a big negative pole wire. As long as the electrical equipment in the car has power supply, the electrical equipment can find a grounding place to work in the car at will, which is why there is no separate grounding wire on the automobile motor. In order to improve the reliability of some electrical equipment, the grounding wire was redesigned.

All electrical devices are connected in parallel.

All the electrical equipment in the car is connected in parallel. The advantage of this design is that if one electrical equipment does not work, other equipment can work normally, and the fault point can be found during maintenance. In addition, according to ohm's law, the parallel voltage is constant and the electrical equipment can work normally.

It is prone to virtual power failure.

Virtual electricity is also unreal electricity. Although it has voltage, it can't work. For example, if an electrical equipment in a car doesn't work, use a multimeter to measure the power supply voltage of the wiring harness, indicating that the electrical equipment is faulty and the replaceable new electrical equipment still doesn't work. This is the phenomenon of virtual electricity. In this case, ordinary test lights can be used instead of electrical equipment. If the test light is on, it means that it is not virtual electricity and there is something wrong with the electrical equipment.