What quantity is measured in Hertz (Hz)?

Hertz (Hz) is a unit of measurement that quantifies frequency, specifically indicating the number of cycles per second of a periodic phenomenon. In the context of electrical systems, frequency is a crucial parameter, particularly when discussing alternating current (AC) systems, where it describes how many times the current changes direction in one second. For example, in the United States, the standard frequency for AC power is 60 Hz, meaning the current alternates 60 times per second.

Understanding frequency is vital for engineers and technicians when designing and analyzing electrical circuits and systems, as it directly impacts the performance of devices such as motors, transformers, and communication systems. By measuring frequency in Hertz, one can determine the operational characteristics of these systems and ensure compatibility with equipment designed to operate at specific frequencies.