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Warning. Probably my guide is confusing. So, please first watch the videos about this topic below:
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https://www.youtube.com/watch?v=G5McJw4KkG8
How a basic battery works- By Kenzo Fachin
WHAT IS BATTERY?
A battery is a device that converts chemical energy into a electrical energy
HOW DOES BATTERY WORK(NON-RECHARGEABLE)
A battery need three component: Anode, Cathode, and a Electrolyte.
Anode is the one that looses electrons(so it becomes positive- the process is called oxidation bty)