What is the unit of resistance?

Resistance is a measure of how much an object opposes the flow of electric current. The unit of resistance is defined as the ohm, symbolized by the Greek letter omega (Ω). One ohm is equivalent to the resistance that allows one ampere of current to flow when a voltage of one volt is applied across a component.

This relationship is captured in Ohm’s Law, which states that voltage (V) equals current (I) times resistance (R), or V = I × R. Therefore, when you think about how we measure resistance, the ohm serves as a crucial unit in the context of electric circuits to quantify this opposition to current flow. Recognizing the specific unit in use helps in understanding and calculating electrical parameters effectively.