How many power sources does a car have? Are there two?

At present, the power supply of most automobiles consists of a battery and a generator, which are connected in parallel, and the whole vehicle is equipped with a backup power supply in the same direction: the battery supplies power when starting (the generator has not yet generated power), and when the power consumption is high after starting, the two supply power together; When the power is low, the generator charges the battery in case the battery is enough when it is started next time!

As for the power management of the car: the live wire of some electrical equipment is directly connected to the positive pole of the power supply through insurance, and these electrical equipment can also be used after the ignition switch is turned off (for example, the lights, horns and anti-theft systems of some cars); Other electrical equipment is connected with relay and ignition switch through insurance, and cannot work after the ignition switch is turned off (such as instrument display, engine ignition, wiper, etc.). Of course, each electrical equipment has its own independent control switch.