Question

how does battery work​

Answer 1

The battery is working in the principle of chemical chain reaction. generally the batteries having main component is electrode and electrolyte. the electrolyte is generally having chemical liquids like lead acid, nickel cadmium , lithium iron. the electrode is having anode and cathode.

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Answer 2

when a device is connected to the light bulb or an electric circuit chemical reaction occur on the electrodes that create a flows of electrical energy to the device.