What does Ohm measure?

Ohms measure the resistance in an electrical circuit. Resistance is the opposition that a substance offers to the flow of electric current, which is a fundamental concept in electrical engineering and physics. The higher the resistance (measured in ohms), the more it impedes the flow of current. This relationship is crucial in understanding how electrical components interact within a circuit, as it determines how much current can pass through a given resistor when a voltage is applied.

While the other options refer to concepts related to electrical circuits—such as voltage (measured in volts) and power consumption (measured in watts)—they do not directly relate to the unit of measurement for resistance. Therefore, resistance, which is quantified in ohms, is the specific and correct focus here.