What is current inversely proportional to?

Current being inversely proportional to resistance is a fundamental concept derived from Ohm's Law, which states that voltage (V) is equal to current (I) multiplied by resistance (R). This relationship can be rearranged to show that current can be expressed as the voltage divided by resistance: I = V/R.

In this equation, if the resistance increases while the voltage remains constant, the current must decrease—hence, current is inversely proportional to resistance. Conversely, if resistance decreases, current increases for the same voltage. This relationship illustrates how changes in resistance affect the flow of current in a circuit.

Other options, while related to electrical concepts, do not represent an inverse relationship with current in the context of Ohm's Law: voltage has a direct relationship with current, power is a function of both voltage and current, and conductivity is also directly proportional to current since higher conductivity allows for increased current flow. Thus, resistance is the correct answer as it specifically defines the inverse relationship with current.