North Carolina EMT State Practice Exam

Hertz is defined as the unit of frequency in the International System of Units (SI), which measures the number of cycles per second of a periodic phenomenon. Therefore, when considering what Hertz represents, it is specifically linked to the number of occurrences (or cycles) happening within the span of one second.

In practical terms, if something has a frequency of 1 Hertz, it means that it completes one full cycle every second. This unit is widely used in various fields such as physics, engineering, and even in medical equipment like monitors that track heart and respiratory rates, providing a clear and standardized way to measure how often a repetitive event occurs. Other options, such as cycles per minute, hour, or day, do not accurately describe what Hertz represents, as they refer to much larger time frames and would require conversion to express frequency in Hertz.