One ohm (1 Ω) is the unit of electrical resistance. It’s defined as the resistance between two points in a conductor when a constant potential difference of 1 volt is applied, causing a current of 1 ampere to flow.
In simpler terms:
- **1 ohm** is the resistance that allows **1 ampere** of current to flow when a **1-volt** potential difference is applied across it.
It’s named after Georg Simon Ohm, the German physicist who first discovered this relationship between voltage, current, and resistance, which is known as **Ohm’s Law**:
**V = I × R**, where:
- **V** is the voltage (in volts),
- **I** is the current (in amperes),
- **R** is the resistance (in ohms).
So, if a material has a resistance of 1 ohm, and you apply 1 volt across it, you'll get a current of 1 ampere.