[ale] [way OT]: Workbench power supply?

[Christopher Bergeron]

Jeff, thanks for the reply...  I'm very familiar with the I*R/V formula, 
but I'm new to the P/VI formula.  I've heard it in books,etc; but never 
used it in practice.   I'm a hobbyist EE, and I've learned most of what 
I know the hard way.  I've been burned by high voltage+low current, and 
I've also "zapped" friends (and felines) with high-current + low voltage 
(Rad Shack lightning ball :) ) for fun.  I don't have a formal education 
in EE, but I've just been learning as I go.  As such, I really 
appreciate your insight.  I've never done anything "stupid" yet - but 
that's why I posted this before "connecting stuff"...

Thanks Jeff !
-CB




Jeff Hubbs wrote:

>On Thu, 2003-05-01 at 21:53, Christopher Bergeron wrote:
>
>  
>
>>So ... I've been looking at workbench power supplies, and I'm SHOCKED at 
>>the prices of them.  Ultimately, what I'd love to have is a +12v power 
>>supply with about 75A current draw capability (I think?!).   I'm trying 
>>to simulate a vehicle power supply on my workbench (for the dashpc 
>>project).  My carPC power supply draws 60-70 DC Watts.  But, I have _NO 
>>IDEA_ how Watts relate/compare to Amps.  I've looked into that a few 
>>time, but I've never found a good result.
>>    
>>
>
>I think what you're looking for is P = V x I.  Volts * Amps = Watts.
>
>  
>
>> From what I can gather with my limited knowledge, I think I'd like to 
>>have a 12-14V power supply, that can handle however many AMPS are 
>>equivalent to my 70 watt DC power supply.
>>    
>>
>
>70/12 = almost 6.
> 
>  
>
>>So, in summary -
>>Could I create this environment by "shotgunning" several PC power 
>>supplies together on the +12v lead?  In serial?  In parallel?!?
>>or
>>Does anyone have a recommendation of a power supply that I could use to 
>>affordably duplicate a vehicle power subsystem?
>>or
>>Can anyone point me toward some understandable information about 
>>wattage/amperage relationship(s)?
>>
>>Much, much, thanks in advance guys!!!
>>-CB
>>    
>>
>
>I might want to suggest that if P=VI is news to you and you're wondring
>if you should put 12VDC power supplied in parallel or in series to make
>12VDC, you might want to think twice before splicing together power
>supplies that could melt your watchband.
>
>- Jeff
>
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