What is the unit of resistance of a circuit?

• A. Amperes
• B. Volts
• C. Ohms
• D. Watts

Answer: (C)

The unit of resistance in a circuit is Ohms. This unit is defined by Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. In scientific terms, one Ohm is equivalent to one volt per ampere, meaning that if a circuit has one volt of electrical potential and allows one ampere of current to flow, its resistance is measured to be one Ohm.

Understanding the unit of resistance is vital for analyzing and troubleshooting electrical circuits, as it helps to determine how much current will flow for a given voltage. The other choices, while important in the context of electrical circuits, represent different electrical concepts: Amperes measure current, Volts measure electrical potential, and Watts measure power. Therefore, selecting Ohms as the unit of resistance is accurate and essential for understanding circuit behavior.