Step 1: Analyzing the units.
Ohm, Ampere, and Volts are all electrical units.
Ohm is the unit of resistance.
Ampere is the unit of current.
Volts is the unit of voltage.
Step 2: Identifying the odd one.
Kelvin is the unit of temperature, which is different from the electrical units listed above.
Thus, the odd one out is Kelvin.