What does the Hertz rating indicate?

The Hertz rating indicates the frequency of alternating current (AC). In electrical terms, Hertz (Hz) is a unit of measurement that defines how many cycles per second an alternating current makes. For instance, in the United States, the standard frequency for AC power is typically 60 Hz, which means the current changes direction 60 times per second. Understanding the Hertz rating is crucial for estheticians because many of the tools and equipment used in the field, such as facial machines and devices that utilize electrical energy, rely on specific frequencies to operate effectively and safely. Proper knowledge of frequency helps in selecting the appropriate equipment for various treatments and understanding its impact on skin and hair.