What unit is commonly used to express resistance in electrical circuits?

Resistance in electrical circuits is expressed in ohms. The unit is named after Georg Simon Ohm, who formulated Ohm's law, which describes the relationship between voltage, current, and resistance. Specifically, this law states that the current (in amperes) flowing through a conductor between two points is directly proportional to the voltage (in volts) across the two points and inversely proportional to the resistance. This fundamental relationship is crucial for analyzing and designing electrical circuits.

Amperes measure the flow of electric current, volts measure the electric potential difference, and watts quantify electrical power, but none of these units represent resistance directly. Understanding resistance is essential for determining how much current will flow through a circuit for a given voltage, thereby assisting electricians and technicians in troubleshooting and designing safe electrical systems.