What resistance does current face in a conductor, as described by Ohm's Law?

The correct response relates directly to the fundamental concept defined by Ohm's Law, which states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance within the conductor. This relationship is summarized by the equation I = V/R, where I represents the current, V is the voltage, and R is the resistance.

In this context, resistance refers to the opposition that the material of the conductor presents to the flow of electric current. Resistance is a key factor in determining how much current will flow for a given voltage; higher resistance means less current. Therefore, in the framework of Ohm's Law, it is resistance that acts as the measure of opposition to current flow in a conductor, making it the correct answer to the question posed.

Understanding resistance is crucial for anyone working with electrical circuits, as it helps in predicting how changes in voltage or the properties of the conductor will affect current flow. The other options—voltage, power, and current flow—represent different aspects of electrical circuits but do not embody the specific opposition encountered by current as expressed in Ohm's Law.