The symbol Hz represents a unit of what?

The symbol Hz stands for hertz, which is the unit of frequency. Frequency measures how often a complete cycle of a periodic phenomenon occurs in one second. In the context of electrical systems, it often refers to the alternating current (AC) frequency, indicating how many times the current changes direction in one second. For example, in many countries, the electrical frequency is typically 50 or 60 Hz, meaning the current changes direction 50 or 60 times each second. Understanding frequency is essential in HVAC systems since it impacts the operation of motors and other components that rely on AC power.