What formula calculates the resistance of a circuit when the voltage and current are known?

Ohm's Law expresses the fundamental relationship between voltage (E), current (I), and resistance (R). The base equation for this relationship is E = I x R. To solve for resistance when the voltage and current are known, you must isolate R by dividing both sides of the equation by I. This results in the correct formula: R = E / I. The distractors represent different calculations or mathematical errors. For instance, E x I is Watt's Law used to find electrical power, and I / E calculates electrical conductance rather than resistance.