How is an ohm defined?

An ohm is defined as a unit of electrical resistance. This unit, named after the German physicist Georg Simon Ohm, quantifies how much an object opposes the flow of electric current. According to Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance, the relationship is expressed with the formula ( V = I \times R ), where ( V ) represents voltage, ( I ) is current, and ( R ) is resistance measured in ohms.

Understanding resistance is crucial in the context of water treatment and electrical systems, as it affects how electricity flows through components such as pumps and sensors. Resistance can influence the efficiency and functioning of these devices, thereby impacting the overall water treatment process.