What is the unit of electrical resistance?

The unit of electrical resistance is the ohm. Resistance measures how much a material opposes the flow of electric current. In practical terms, an ohm quantifies the opposition that a single volt provides to move one ampere of current through a conductor. This understanding stems from Ohm's Law, which relates voltage (volts), current (amperes), and resistance (ohms) in the relationship V = I × R, where V is voltage, I is current, and R is resistance.

To put this in context, other terms include volts, which measure electrical potential; watts, which measure electrical power; and amperes, which measure electric current. While all these units relate to electricity, they represent different aspects of electrical circuits. This makes the concept of ohms crucial for understanding how much resistance a circuit presents to the flow of electricity.