Why is a definition of a coulomb the energy transferred from one amp over one second, but then the definition of an amp is one coulomb moving past a point in one second? The definitions use eachother! So how can you define this with something else that already uses the word!?

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Answer 1

That’s not how the Coulomb is defined. A Coulomb is currently defined by fixing the value of an elementary charge(the charge of a proton or electron) at 1.602176634×10^−19 Coulombs, and the amp is defined in terms of that and the second.

In the past, it went the other way. The amp was defined in terms of a force exerted on wires with current flowing through them, and the Couloumb was defined in terms of the Amp and the second.