Peak to peak voltage of 120v

As you may know, an AC oulet outputs 120V. This voltage is not the peak-to-peak voltage. If you need an explanation of RMS voltage, see RMS Voltage and Current-Explained. This same 120Vrms is 170V in peak voltage.

So in peak-to-peak voltage , it is 3volts.

So the voltage which comes out of .

It calculates the peak to peak voltage value from either the peak voltage , rms voltage, or the average voltage.

And the answer is, it is RMS voltage. I was expected more around 120V (I am in the USA). UPDATE: It sounds like it may be reporting peak voltage instead of RMS. For the waveform shown above, the peak amplitude and peak value are the same, since the average value of the function is zero volts. The RMS voltage calculator calculates the RMS voltage value from the peak voltage , the peak-to-peak voltage , or the average voltage.

AC meters display RMS voltages. The standard value of 120VAC used in the power grids in the United States is an RMS voltage, and the appropriate way to describe this voltage is 120Vac, or 120V RMS. It means the voltage measured by the RMS method is 120V.

For sine wave power (which is what you get), the peak is 170V and the peak to peak voltage is 340. Peak amplitude is how they describe sine waves in trigonometry class, but not for electrical measurements. The rms value which is the default way of describing power mains is 120V.

In US and some other countries the RMS value or effective value of AC supply voltage is 120V at 60Hz. Therefore, more peak voltage is required to compensate for this downtime. The reason that RMS is used over peak voltage comes down to power calculations.

Just measure the peak voltage of the AC waveform and divide by the square root of 2. The problem is that voltage and current signals almost . For example, if the peak voltage is 1volts, the RMS voltage will be 1volts. The horizontal axis shows the passing of time, progressing from left to right. The vertical axis shows the quantity measured (this is voltage in Fig .). Instantaneous value of the voltage , in volts (V). VM, Maximum or peak value of the voltage , in volts (V).

T, Period: The time taken for one cycle, in seconds.