In which unit is frequency measured?

Frequency is measured in Hertz (Hz), which quantifies the number of cycles per second of a periodic wave or signal. It is a fundamental unit in electrical engineering and physics, and it plays a crucial role in fields such as telecommunications, audio engineering, and power systems. The term "Hertz" honors Heinrich Hertz, the physicist who contributed significantly to the study of electromagnetic waves.

In practical applications, understanding frequency is essential for designing and analyzing circuits, particularly those involving alternating current (AC) where the frequency of the signal determines the behavior of the circuit elements, such as capacitors and inductors. For instance, in AC power systems, the frequency can affect the efficiency of power transmission and the performance of electrical equipment.

While the other units listed—volts, farads, and henrys—relate to electrical concepts (volts for voltage, farads for capacitance, and henrys for inductance), they do not serve as a measure for frequency, thereby making Hertz the correct choice.