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How to determine the peak value up and effective value u of sine wave?
The peak value is the maximum value of sine wave voltage, and the effective value is divided by the root number 2 of the peak value of sine wave voltage.

The maximum value of sine wave voltage is divided by root number 2, and the result is the effective value of sine wave voltage. Expressed by the formula: U = up/root sign 2 equals 0.707Um.

Sine wave is a signal with a single frequency component, so it is named because its waveform is sinusoidal in mathematics. Any complex signal, such as spectrum signal, can be regarded as a composite of many sine waves with different frequencies and sizes.