[TechAssist] Re: Voltage Rating of Resistors
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 24 Apr 2005 23:16:33 -0400
What is the peak power rating of the resistors? You are asking the three
reistors to handle a peak power of 535 watts.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
To: ".TECHASSIST @ freelists . org" <techassist@xxxxxxxxxxxxx>
Sent: Sunday, April 24, 2005 8:22 AM
Subject: [TechAssist] Voltage Rating of Resistors
> If anyone is very familiar with the voltage ratings of carbon
> film resistors, I could use some help.
>
>
> I would like to know if the Max. Overload Voltage of carbon
> film resistors (this is 2 x times the working voltage) would
> apply in this instance:
>
> I would like to use three 1.8k, 1/2W resistors* in series
> with a 1700VDC supply to charge a 0.5uF capacitor. It will
> fully charge in approx. one second.
>
> * 1/2W carbon film resistors are rated at 350V (working voltage)
>
> I realize that this is not exactly a surge condition, however
> the voltage exceeding the rating of these resistors would
> only exist for about 1/2 second (and would be below the Max.
> Overload Voltage of the 3 resistors wired in series).
>
> This is to be used in a magnetic pulse generator in which the
> capacitor discharges into a coil once per second (one second
> to fully charge and a very small fraction of one second to
> discharge).
>
> This instrument would only be used for a few minutes per day,
> and must be reliable.
>
> I will be ordering some 1W resistors (500V rating), but have
> a couple units that need to be shipped out on Monday.
>
> From what I've read, it's common for engineers to not consider
> the voltage rating of resistors when designing circuits, so I
> don't feel negligent, since I am doing the best I can at this
> time.
>
> Bil
>
> PC 1000
> Mammoth Lakes, CA
> 760-924-1000
> M-Pulse 5000 magnetic pulse generator
> http://www.heal-me.com.au/m-pulse5000.htm
>
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