How a Does a Car Battery Work?


Getting the motor going, is the Car Batteries job. A car is as good as dead with out the electric energy from the battery. Not only does the Car Battery generate enough juice to start the motor. It actually makes its own when the motors run. That’s because this plain looking box, accomplishes two Diametrically opposed functions using exactly the same ingredients. It generates electricity, and it accumulates electricity. The Car Batteries manages this incredible feat by exploiting reversible chemical reactions.

Okay, so how does a car battery work? A car battery has a positive and a negative terminal there connected to the car, and send a flow of electrons to power the wipers, headlights, radio, air conditioning, and most importantly the engine starter. Inside the car battery are six small energy producing units called cells. Each cell has two sets of electrodes. Their made of eight over lapping metallic plates. For a total of 16 per cell. Together the plates form a compact grid, the bigger the grids overall surface the more power it generates. The positive grid, covered in led oxide, carries electrons in. The negative grid covered in led, releases electrons.

The plates soak in a chemical bath, 65% water, 35% sulfuric acid. Volatile chemicals, if you are not careful a drop of it will eat threw your clothes, and burn off your skin. But, the key to the Car battery, is all those powerful chemicals reacting with each other inside the cells. Reaction repeating as the battery drains. The bath of water and Sulfuric acid, acts as an electrolyte, a substance that conducts electricity. As the battery discharges, or unloads electricity, the acid bath reacts to chemicals on the plates. The led cover in one cell grid, and the led oxide covering the other. Dipping them in the electrolyte bath, releases particles called electrons. When they start racing in the grids, they create electricity.

As the electrons race from the positive grid of the first cell and out the negative grid, they produce 2 volts of electricity. The led and led oxide covering the electrodes have been chemically transformed. And when the electrons from the first cell zoom into the second cell, they pick up another 2 volts. For a total voltage of 4, by the time the electrons charge out of the sixth cell, they have a combined voltage of 12. That’s a fully loaded car battery, with enough juice to power the starter, and crank the engine. Once you’ve squeezed out all the juice to start the motor, the fuel system takes over and keeps the motor running.

The Car’s alternator take over the rest of the electrical chores, time for the battery to juice it self up. It recharges by reversing the chemical reactions. Electrons coming from the car’s alternator now enter the battery threw the negative grid of the cells and come out the positive side of the cell. The chemicals on the grid go back to normal, and the battery is recharged and ready to put out another 12 volts of electricity. That is unless you happen to leave the car lights on overnight, in that case, the chemical reactions move in one direction, draining the battery, which never get the chance to recharge it self, the inevitable result is a dead battery.


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