👉 In physics and engineering, a harmonic is an oscillating signal that has a constant amplitude (magnitude) over time. A harmonic can be defined as a function of time that repeats itself with a fixed period. Examples include sine waves, square waves, and circular waves. Harmonics are fundamental in the study of periodic phenomena, such as sound waves, light waves, and radio waves. They are also used in many applications in engineering, such as circuit analysis, signal processing, and control systems.
