A short answer.
First we have to understand what a battery is made from. A battery consists of a number of separate cells. Each cell contains two different plates. The plates are held fixed and...
Batteries convert chemical energy into electricity. Batteries are made up of one or more separate sections, or cells, containing a chemical called an electrolyte. Each cell has two electrically...
It grounds the body and motor of the car so that everything electrical will work. Anything electrical has to have positive and negative to work. At least in a car.