Which term describes opposition to the flow of current in a circuit, measured in ohms?

• A. Input
• B. Resistance
• C. Sensor
• D. Process

Answer: (B)

Opposition to the flow of current in a circuit is called resistance, and it is measured in ohms. This quantity tells you how hard it is for electrical current to pass through a component. Ohm’s law links these ideas: current equals voltage divided by resistance (I = V/R). So, for a given voltage, higher resistance reduces current, while lower resistance allows more current to flow. The ohm is the unit used for this opposition, reflecting how much the component resists the movement of electrons.

In practical terms, a resistor is the component that provides this opposition. The other terms describe different ideas: an input is the signal or power that enters a system, a sensor is a device that detects a physical quantity, and a process is a series of actions or steps. None of these describe the circuit’s opposition to current in the way resistance does.