What is the SI unit of resistance?

The SI unit of resistance is the ohm. The ohm is defined as the resistance between two points when a constant potential difference of one volt applied across those two points results in a current of one ampere. This relationship is described by Ohm's Law, which states that voltage (V) equals current (I) multiplied by resistance (R), or V = I × R.

Understanding the role of resistance in electrical circuits is crucial. Resistance determines how much current will flow under a given voltage. The concept of resistance is fundamental in both designing circuits and analyzing their behavior, making ohms a key concept in electrical engineering and physics.