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The definition of electric current is based on the flow of electric charge in a circuit. Specifically, electric current is defined as the rate at which charge flows. This is mathematically expressed as the amount of charge that passes through a point in the circuit per unit of time, making "charge per time" the correct option.

Current is typically measured in amperes (A), where one ampere corresponds to one coulomb of charge (the unit of electric charge) passing through a point in a circuit in one second. This fundamental concept is crucial for understanding how electrical circuits operate and how various components interact within them.

The other options do not correctly describe electric current. Voltage per time does not relate directly to current, as voltage is the potential difference that drives the current. Power per voltage pertains to the relationship between the two quantities but does not define current itself. Current per resistance reflects Ohm's law, but again, this is describing a relationship rather than defining what current is. Thus, the most accurate definition of electric current is indeed the flow of charge per unit time.