1ohm

1ohm is a unit of electrical resistance. It is defined as the resistance between two points of a conductor, when a constant potential difference of one volt applied between these points produces in this conductor a current of one ampere. This definition is based on Ohm's Law, which states that the voltage across a resistor is directly proportional to the current flowing through it, with the resistance being the constant of proportionality.

The ohm is named after Georg Simon Ohm, a German physicist who discovered Ohm's Law in 1827. The symbol for the ohm is the uppercase Greek letter omega, $\Omega$. Resistors are electronic components that are designed to have a specific resistance value, measured in ohms. These resistors are used in a wide variety of electronic circuits to control the flow of current and voltage.

The ohm is a fundamental unit in electrical engineering and physics. It is used in calculations involving power, voltage, and current. For example, power dissipated by a resistor can be calculated using the formula $P = V^2/R$ or $P = I^2R$, where P is power in watts, V is voltage in volts, I is current in amperes, and R is resistance in ohms. Understanding the ohm and its relationship to voltage and current is crucial for analyzing and designing electrical systems.