What is the spectrum of a square wave?

Sine wave inverters are used to support household appliances such as refrigerators ovens, computers, laptops, etc. Square wave inverters are less reliable and also unsafe to use for appliances . Sine inverters are highly safe to use. Square wave inverters produce a very loud noise when used.

Note that only the first six harmonics are shown individually, but 10 harmonics are used to generate the square wave.

It contains a sine wave fundamental, and all its odd harmonics . The amplitude of each harmonic is 1/n, so the amplitude of the fifth harmonic, for example, would be 1/5 the amplitude of the fundamental. … A perfect square wave would have no even harmonics.

Frequency spectrum of a signal is the range of frequencies contained by a signal . For example, a square wave is shown in Fig. 3.5A. It can be represented by a series of sine waves, S(t) = 4A/π sin(2πft) + 4A/3π sin(2π(3f)t) + 4A/5π sin(2π(5f)t + …)