Thursday 18 April 2019

temperature - Resistance of car battery


In my textbook, it is given that internal resistance of a car battery increases with decreasing temperature. But car batteries contain lead, which is a metal, and hence the resistance should decrease. Where am I wrong?



Answer



If the battery only contained lead, you might be on to something. However, batteries are made with both metals AND something to transport the charges, called an "electrolyte". This is normally a liquid, and liquids have less motility as they get colder. This motility refers to the speed with which something can move through the liquid.


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