SINE WAVE

In its purest form, alternating current has a sine-wave, or sinusoidal, nature. The waveform in Fig. 1 is a sine wave. Any ac wave that consists of a single frequency has a perfect sine-wave shape. Any perfect sine-wave current contains one, and only one, component frequency.
In practice, a wave can be so close to a sine wave that it looks exactly like the sine function on an oscilloscope when in reality there are traces of other frequencies present. Imperfections are often too small to see. Utility ac in the United States has an almost perfect sine-wave shape, with a frequency of 60 Hz. However, there are slight aberrations.

Fig. 1. A sine wave. The period is the length of time required for one cycle to be completed.

مواضيع ذات صلة

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