A battery is a device in which the energy of a chemical reaction is converted into electricity. This is accomplished by immersing two metals in an electrolytic solution, where the electrolyte, a non metallic conductor, dissociates into charged components, or ions. The metals must be chosen according to their electrochemical activity, which depends on their ability to gain or lose electrons. This gain or loss causes a potential difference or voltage, between the two metals. When the metal are connected by an external circuit to a load such as light bulb, a current of electrons will flow from one metal (the anode), through the wire and the load, to the other metal (the cathode). Ion carry the current through the electrolyte solution and complete circuit.
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