Peak-to-peak (pk-pk) is the difference between the maximum positive and the maximum negative amplitudes of a waveform, as shown below.

Peak-to-peak值指的是正负最大相差值，如下图所示：

 If there is no direct current (DC) component in an alternating current (AC) wave, then the pk-pk amplitude is twice the peak amplitude.

对正弦交流波来说，Peak-to-peak电压值是最大电压值的两倍。

p.s. 算功率时，要用的是有效值，即最大电压值除以√2(根号2)。

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