By definition in Ohm's Law, 1 ohm equals 1 volt divided by 1 ampere. In other words, a device has a resistance of 1 ohm if a voltage of 1 volt will cause a current of 1 ampere to flow.
A measurement in ohm is the reciprocal of a measurement in siemens (also called mho), the SI unit of electrical conductance. Note that 'siemens' is both singular and plural.
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