An ohm is a unit of measurement used to measure the resistance of a material to the flow of current in an electrical circuit. It measures how much one volt can resist while simultaneously causing one ampere to flow. A larger number of ohms signifies greater resistance.

The ohm is basically a unit of electrical resistance. It is equal to the electrical resistance of a conductor in which a potential of one volt produces a current of one ampere across one of its terminals. It is symbolised by the Greek capital letter O (or omega). While the ohm is the unit of measurement for electrical resistance in a DC (or direct current) circuit, it also measures impedance in AC (or alternating current) circuits. It was named after the German scientist Georg Simon Ohm (1787 to 1854), who formulated the Ohm's law. Ohm was the first physicist to study the relationship between voltage and current.

The ohm is basically a unit of electrical resistance. It is equal to the electrical resistance of a conductor in which a potential of one volt produces a current of one ampere across one of its terminals. It is symbolised by the Greek capital letter O (or omega). While the ohm is the unit of measurement for electrical resistance in a DC (or direct current) circuit, it also measures impedance in AC (or alternating current) circuits. It was named after the German scientist Georg Simon Ohm (1787 to 1854), who formulated the Ohm's law. Ohm was the first physicist to study the relationship between voltage and current.