What is Vrms?

[Jacobk]

Well the title says it all.

 

[ChrisP58]

Volts RMS. Root Mean Square is a way of accurately quantifying the effective voltage when the voltage waveform is something other than a non varying DC voltage.

 

[Jacobk]

Thank you, i also have another question regarding ng Vrms, i was looking at a calculator for a cockcroft Walton voltage multiplier and one of the fields you had you had to enter was Vrms. Now what i dont get is the the value for Vrms was numeric, what would that mean?

 

[KeepItSimpleStupid]

Not sure I like the definition to a newbie. I'll use this one: The RMS value of a waveform applied to a resistive load would have the same Power delivered.

i.e. P=(V^2)/R. if V was 12 V RMS or 12 VDC and the resistance was one ohm, the power delivered is the same.

A typical DVM typically measures the average value of the absolute value of a signal and multiplies it by a constant to give the RMS value of what it thinks is a sine wave.

There is a Calculus formula for computing the RMS value of any periodic waveform and there are easy ways of converting the peak to peak or 0 to peak values of a sine wave. Furthermore TRMS meters usually have a DC and DC+AC mode of operation.

 

[ChrisP58]

Thank you, i also have another question regarding ng Vrms, i was looking at a calculator for a cockcroft Walton voltage multiplier and one of the fields you had you had to enter was Vrms. Now what i dont get is the the value for Vrms was numeric, what would that mean?

Yes, the voltage will be a numeric value. Is it asking for the input voltage, or the output voltage?

If the input is DC, (from a battery or a well filtered power supply) then the RMS voltage will be the same as the DC voltage.