eli5: Why do seemingly all battery powered electronics need at least 2 batteries?
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Your typical alkaline battery, whether it’s AA or C or D, has a nominal voltage of 1.5V — that is, it can exert 1.5 “units” of “electrical pressure” on a circuit it’s installed into.
That’s not a super useful amount of voltage, but 3V is — and by placing two batteries in series, you end up at 3V because you add the voltages together.
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