There are two sources of current in the car: the battery and the generator, which supplies voltage only when the engine is running. What is the purpose of both sources?
The battery supplies power to electrical appliances when the engine is not running and starts the engine with its help. The generator supplies electrical appliances when the engine is running.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.