The relationship can be expressed mathematically as I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms. 

This formula is called Ohm's law and provides a simple way to calculate any one of these three values if you know the other two. For example, if you know the voltage and resistance of a circuit, you can use Ohm's law to calculate the current flowing through it. Conversely, if you know the current and resistance, you can use Ohm's law to calculate the voltage drop across that part of a circuit.
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