A CAR BATTERY

A battery consists of numbers of cells.Six-volt batteries have three cells.Twelve-volt batteries have six cells.The cells have positive and negative plates.Most plates are made of lead.They are usually named electrodes.Positive electrodes are termed anodes,and negative electrodes ar known as cathodes.Both anodes and cathodes are immersed in a liquid.This liquid is called an electrolyte.The electrolyte generally contain an acid.For example,a common electrolyte consists of sulphuric acid(H2SO4)plus water.The battery works with produces electricity because the acid reacts with the electrodes.Electrick current flows from the negative electrode(cathode)to the positive electrode(anode)through the electrolyte.When the reaction between the sulphuric acid and the lead finishes,the electrolyte is very weak.The battery is flat and therefore cannot produce any electricity.When the battery is recharged with an electric current,the electrodes are converted back to their original condition.On most cars the earth is connected to the negative terminal,on some to the positif terminal.Check carefully before removing the leads.