Which unit is used to measure electrical resistance?

The unit used to measure electrical resistance is Ohms. This is a fundamental concept in understanding how electrical circuits function. Resistance is defined as the opposition that a substance offers to the flow of electric current. According to Ohm's Law, resistance can be calculated by the voltage applied across a material divided by the current flowing through it.

The connection to Ohm's Law illustrates how this unit is crucial in determining how easily electricity can flow through a conductor, such as a wire. High resistance means a material does not easily allow the flow of current, while low resistance indicates that it allows current to flow more freely.

In electrical measurements, volts measure the potential difference, amperes measure the current flow, and coulombs quantify electric charge. None of these directly measure resistance, which is why Ohms is the correct unit in this context.