What is the unit of frequency?

Frequency refers to the number of cycles an alternating current or radio wave completes in one second. The international standard unit for this measurement is the Hertz (Hz), named after Heinrich Hertz, the physicist who proved the existence of electromagnetic waves. The other options are units for different electrical properties: the Henry is the unit of inductance, the Farad is the unit of capacitance, and the Tesla is a unit of magnetic flux density.