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Voltage and current are two different things.

Voltage is the electric potential difference between two points. Expressed in volts, it is also joules per coulomb.

Current is the charge flow past a point. Expressed in amperes, it is also coulombs per second.

You can relate voltage and current using Ohm's Law, which states that voltage is equal to current times resistance.

Resistance is, therefore, equal to voltage divided by current. Using base units, resistance is equal to joules per coulomb divided by coulombs per second, which simplifies to joule-seconds per coulomb squared. That is a difficult unit to write, so we just use ohms as the unit.

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