What is the unit of electrical resistance?

The unit of electrical resistance is the Ohm. This unit is a measure of how much a conductor opposes the flow of electric current. According to Ohm's Law, resistance (R) is defined as the ratio of voltage (V) to current (I), which can be mathematically expressed as R = V/I. Thus, the Ohm encapsulates the relationship between these key electrical quantities.

Understanding resistance in Ohms is crucial for ham radio operators because it helps in designing circuits, analyzing power distribution, and ensuring that devices operate within safe limits. This understanding is vital for overall system performance and reliability.

The other units presented—Volt, Ampere, and Watt—represent different electrical properties. The Volt measures electric potential, the Ampere measures electric current, and the Watt measures electrical power. Each has its specific role in electrical engineering, but none of them define the property of resistance, which is solely expressed in Ohms.