Comments: What is a Battery?
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I understood what cell is about But you have said a battery is made up of one or more cells right? so is it not a single AA or AAA can be called as cell as well as a battery? I have seen some website saying two or more cells make a battery
Hi there, it sounds like you are looking for more information on this topic. I recommend looking into lithium polymer (lipo) batteries, as there is a greater diversity between single and multiple cells; and therefore, more information on the differences.
That being said, it depends on the chemical process and rating of the battery. However, yes... most alkaline AA and AAA batteries are single-cell batteries.
But what we have taught in school is that Cathode is a negatively charged terminal from which electrons go out to external circuit and Anode is the possitive terminal of a battery at which electrons enter from external circuit. please explain.
The cathode is the terminal from which conventional current leaves the device, and an anode is the terminal into which conventional current enters. Note that this has nothing to do with whether the terminal is positive or negative.
On a battery, conventional current leaves from the positive terminal (cathode) and enters on the negative terminal (anode).
On something like a diode, conventional current leaves from the negative terminal (still the cathode) and enters on the positive terminal (still the anode).
The cathode and anode Wikipedia articles do a good job of explaining the nomenclature in better detail.