They’d mean that in the sense of a scientific theory, so it means it’s a set of rules that make accurate predictions and are a useful way to think about what’s happening even though we can’t directly confirm it with our senses. It doesn’t mean a wild-ass guess, like many people mean when they say the word ‘theory’.
It includes ideas like electrons (little particles you can’t see, which move through wire kind of like water through pipes), voltage (the energy the electrons have), current (how much electron flow there is) resistance (how blocked-up or narrow the pipes are), and lots, lots more.
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