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- 16th December 2005, 09:27 #1

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## 220v rms

sorry for this silly question .but i can't find the answer anywhere..

- 16th December 2005, 09:45 #2

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## 220 v rms

It is RMS ..

If you would like to read more on this issue, here is a link:

http://www.eng.uct.ac.za/~victor/electric/ACDC.htm

Regards,

IanP

- 16th December 2005, 09:59 #3

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## 220v rms?

It is in RMS... same as 110V in power lines

- 16th December 2005, 11:42 #4

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## 110v vrms

its RMS

1 members found this post helpful.

- 16th December 2005, 12:03 #5

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## relation between rms and peak

moreover .why it should be RMS ....why should not as +340V,-340V while referring

- 16th December 2005, 12:03

- 16th December 2005, 13:59 #6
## relation between rms and peak voltage

Originally Posted by**electronics_kumar**

e.g. for**resistive loads**power can be simply calculated multiplying current and voltage rms values: P = Vrms * Irms,**whatever waveform it represents!**

(or P = Vrms*Vrms/Rload, or P = Irms*Irms*Rload, likewise with dc values)

Referring to the peak value (only for sine waveforms!!!) power would be calculated:

P = Vpeak * Ipeak / 2 (or P = Vrms*Vrms/(2*Rload), or P = Irms*Irms*Rload/2)

It allows to compare or evaluate "power contents" of different waveforms in a way, while its peak values don't give any information as to this point.

Best Regards

Eric

- 16th December 2005, 13:59

- 16th December 2005, 15:46 #7

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## rms 220v

Try to grab a Digital Multimeter (select it as to measure AC voltage with range of at least higher on what you are expected to measure) Now read the Meter, it should read 220V (note all meter device should read RMS values)

- 16th December 2005, 19:44 #8
## 220 vrms

Originally Posted by**the_risk_master****display**rms value but this fact does not mean they really**measure**it. If they do, you can see the notice "True RMS" somewhere on the device and such a device is also appropriately more expensive (it requires a built-in rms converter). Other devices usually measure peak or mean value of a rectified waveform and take advantage of the fact that the relations between peak/mean and rms (root mean square) values for a known waveform, in this case**sine wave**, are constants so that they can recalculate it and display. This fact implies that such a device displays the more inaccurate value (sometimes really nonsens) the more the measured waveform "differs" from sine wave.

For instance waveforms in circuits with a phase controlled SCR (thyristor or triac) give quite big errors measured with non-true rms devices.

Just for interest, the mentioned values are defined as follows:

For periodic waveforms v(t):

mean value =

rms value = ,

where T is the time period.

Sine wave:

If v(t) = M×sin(ωt),

where M ... peak value of the sine wave,

ω = =  ... circular frequency, we obtain:

mean value = 0

if fully rectified, then

mean value = = 0.637M ... relation between mean (fully rectified) and peak value

rms value = = 0.707M ... relation between rms and peak value

rms/mean (fully rect.) = = 0.707/0.637 = 1.11 ... relation between rms and mean value of fully rectified sine wave

Best Regards

EricLast edited by BlackMamba; 27th August 2010 at 12:58.

- 16th December 2005, 19:44

- 19th December 2005, 03:51 #9
## sin rms peak

**R**oot**M**ean**S**quare

- 24th December 2005, 21:04 #10
## 220 v peak to peak

Originally Posted by**ysenthilece**

- 13th February 2007, 02:07 #11

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## relation between rms and peak value

220 is rms.peak voltage is 1.4*220=308v

- 13th February 2007, 13:12 #12

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## rms voltage 220v

it is a RMS voltage

- 14th February 2007, 00:57 #13

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## i rms i peak

it is exaclty rms (root mean square) and it peak voltage is √2×220 (v).

- 14th February 2007, 05:38 #14

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## rms and peak to peak

RMS VALUE

- 14th February 2007, 08:17 #15
## it(rms) scr calculation

Are you collecting points or what?

STOP these stupid messages, everybody already KNOWS it is rms!!!

- 14th February 2007, 08:27 #16

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## calculate 220 rms peak value

if its a sine wave its rms value..

if its a nonsinusoidal wave it wont be RMS...any way becoz every wave can be converted as composition of sine wave there is a true rms meter which gives rms for any wave..gen all ac and dc volts xpressed in rms ..

- 14th February 2007, 11:12 #17

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## 310v sine rms

It should be rms.

- 14th February 2007, 11:57 #18

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## 26 vrms vs peak

Its RMS .Please check BL thereja u can get all the details.

- 14th February 2007, 12:40 #19

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## 220v rms peak

It is RMS, the peak voltage is RMS * sqare root o f2, say about 310 V.

The multimeters ( low price ) usually rectify the voltage ( taking the peak voltage ) and then they divide it by SQRT of 2.

Mandi

- 19th February 2007, 21:48 #20
## p=vrms*irms

It's RMS!

Low price multimeters aren't True RMS, but if the signal you are messuring it's a Sine Wave there's no problem!! If not, the values shown would not be correct.........

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