released by chemical reactions produces a flow of electrons. The greater the energy produced by the chemical reactions, the greater the electron flow. Those electrons provide a current to whatever the battery is powering — kitchen clock, smoke alarm,
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, car engine.

Battery basics


Batteries have three main components: two electrodes (the anode or negative electrode,
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, and the cathode,
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, positive) and the electrolyte,
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, which helps ions move inside the battery. Chemical reactions at the anode release electrons, which travel through an external circuit to power a lightbulb or other device.




To power any such device, the electrons must flow through a circuit connecting two electrodes,
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, known as an anode and a cathode,
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, separated by a substance called an electrolyte. At the anode,
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, chemical oxidation reactions release electrons. At the cathode,
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, electrons are taken up in reduction reactions. The electrolyte enables ions created by the oxidation and reduction reactions to pass back and forth between the two electrodes, completing the circuit.
Depending on the materials used for the electrodes and the electrolyte, a battery may be recharged by supplying current that drives the chemical reactions in reverse. In creating new

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