Which of the following is a measure of resistance?

Ohms is indeed the correct measure of resistance in an electrical circuit. Resistance is defined as the opposition that a substance offers to the flow of electric current, and it is quantified in ohms (Ω). This concept is central to understanding Ohm's Law, which states that the current (in amperes) through a conductor between two points is directly proportional to the voltage (in volts) across the two points and inversely proportional to the resistance (in ohms).

Amps measure the flow of electric current, indicating how many electrons are flowing through a circuit. Volts measure electrical potential difference, which is the force that pushes electric charges through the circuit. Watts represent electrical power, which is the rate at which electrical energy is transferred and is calculated as the product of volts and amps. Each of these units plays a different role in electrical systems, with ohms specifically relating to resistance.