What is the unit of measure for electrical resistance?

The unit of measure for electrical resistance is Ohm. Ohm is defined as the amount of resistance that allows one volt to produce one ampere of current. This relationship is a fundamental concept in electrical engineering, often encapsulated in Ohm's Law, which states that voltage (V) equals current (I) times resistance (R). Therefore, the Ohm serves as a crucial unit in quantifying how much a material opposes the flow of electricity, making it integral in both theoretical and practical applications within electrical circuits.

In contrast, the other options represent different electrical quantities. The Ampere is a unit of measure for electric current, indicating the flow of electric charge. The Volt is a unit of electric potential difference or electromotive force. The Watt measures power, indicating the rate at which energy is transferred. Each of these quantities plays a distinct role within electrical systems, but when specifically discussing resistance, Ohm is the appropriate unit.