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Nishant
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Join Date: Aug 2007
Location: INDIA
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AC RMS and DC Calculation

06/23/2009 8:27 AM

Dear All

plz guide on

We have calculated as follows is it ok ?

AC RMS Voltage = DC Voltage X Root 2

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JohnDG
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#1

Re: AC RMS & DC Calculation

06/23/2009 8:34 AM

"AC RMS Voltage = DC Voltage X Root 2"

Afraid this doesn't actually mean anything, out of context.

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NAVEED
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Join Date: Mar 2009
Posts: 11
#4
In reply to #1

Re: AC RMS & DC Calculation

06/24/2009 12:19 AM

Vrms=Vmax / root of 2. where Vmax is the peak ac voltage and V rms is its dc equivalent why you are using the formula you specified...
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Anonymous Poster
#5
In reply to #4

Re: AC RMS & DC Calculation

06/24/2009 8:09 AM

Naveed Sir

actually, we are going to test automotive ignition switch.

in that require test is on - 24 VDC / 5 Amp Inductive load

but we have no Inductive load for DC, but AC Inductive load is available, so we are searching for alternating for test.

any alternative ?
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nesubra
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#6
In reply to #5

Re: AC RMS & DC Calculation

06/24/2009 8:19 AM

You cannot have an inductive load in DC circuit.Only resistive .AC You can have an Impedance value which can give u the same current value

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JohnDG
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#7
In reply to #6

Re: AC RMS & DC Calculation

06/24/2009 8:43 AM

The point about an inductive load for testing a switch at DC is what happens when switching on & off.

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wareagle
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Location: Alabama
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#2

Re: AC RMS & DC Calculation

06/23/2009 10:18 AM

Your equation is not correct. Check the link below for information on RMS voltage.

http://www.bcae1.com/voltages.htm
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perry
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#3

Re: AC RMS and DC Calculation

06/23/2009 11:58 PM

nishant; 120 volts D.C. will give you the same heat as 120 volts A.C. RMS. perry
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