National League for Nursing (NLN) Science Practice Exam

The primary measure of an object's resistance to the flow of electric current is indeed resistance. This is a fundamental concept in electrical engineering and physics. Resistance quantifies how much an object opposes the flow of electrical charge, and it is measured in ohms. The greater the resistance, the less current will flow for a given voltage applied across the object. In the context of Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R), it becomes clear how resistance plays a crucial role in determining the behavior of electrical circuits. Therefore, when evaluating how well an object conducts electricity, resistance is the key factor that determines its ability to allow current to pass through. Voltage, power, and current are related concepts but serve different functions. Voltage measures the electric potential difference between two points and drives the current. Power refers to the rate at which electrical energy is consumed or converted, which is also dependent on current and voltage. In contrast, resistance specifically characterizes the obstruction to current flow.