To ELI5 that might take a hundred thousand words or so. Electrical signals aren’t turned into ones’s and zero’s they are ones’s and zero’s. Usually a high voltage (not actually that high like 3.3v) is a one and a low voltage (~0v) is a zero.
[This video](https://www.youtube.com/watch?v=5XbRIVWFRIw) explains how those electrical signals are used to add numbers.
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