Phasor Representation of voltage and current waveforms

[electronicsman]

I am bit confused with the Phasor representation of voltages and currents. Does the magnitude of the phasor length is RMS value or Peak value? Please advise.

 

[KlausST]

Hi,

Peak.
It's a (rotating) vector. So the maximum ( = peak ) extension in X-axis is the length of the vector.

Klaus

 

[electronicsman]

The above explanation provide in the website https://www.electronics-tutorials.ws/accircuits/phasors.html
It really confuses. My understanding is it should be a peak value.

 

[FvM]

Phasor is not a rotating vector, it's a static vector representing a sine quantity. Scaling of vector length is a matter of convention. In power electronics we prefer rms, as used in the linked tutorial.

 

[electronicsman]

Phasor is not a rotating vector, it's a static vector representing a sine quantity.

I am sorry i did not understand when you said it is not a rotating vector. Does it make any difference? Can I use the RMS values for both rotating vector and static vector? And also how do i know if i am using RMS value or Peak value, do i need to indicate in the representation? I know static vector is called the phasor, does rotating is also called phasor or by another name? Please advise.

 

[KlausST]

Hi,

I have to admit that the phasor magnitude may be the RMS value.

Klaus

 

[FvM]

Can I use the RMS values for both rotating vector and static vector? And also how do i know if i am using RMS value or Peak value, do i need to indicate in the representation? I know static vector is called the phasor, does rotating is also called phasor or by another name?

The length of a rotating vector corresponds obviously to a peak value. For the time invariant phasor constant, both rms and peak is used, depending on the application range. If there's a risk of ambiguity, you should declare your usage. In some literature, the rotating vector is also called phasor, hence the requested clarification can't be made.