Re: Heating effect of AC vs DC
- From: Tom MacIntyre <tom__macintyre@xxxxxxxxxxx>
- Date: Tue, 08 Nov 2005 20:36:11 GMT
On Tue, 08 Nov 2005 04:22:14 GMT, Ken Weitzel <kweitzel@xxxxxxx>
wrote:
>
>
>Surfer wrote:
>> I would like to test the current carrying capability of a connector that's
>> used in a 208VAC 3-phase circuit. I have the manufacturer's spec (10 amps at
>> 300V) and just want to verify performance in this application. For reasons
>> that would take too long to explain, I want to test this connector out of
>> circuit. It was suggested to just use a low voltage supply, like a PC power
>> supply and set up a resistive load that would deliver 10 amps.
>>
>> Since the formula for power, P=I^2*R doesn't include a value for voltage,
>> would 10 amps at 3VDC provide the same heating effect as 10 amps at 208VAC?
>
>Hi Surfer...
>
>Good plan, hope you share how this is done and we'll all be
>zillionaires :)
>
>Sorry, couldn't resist, meant no disrespect.
>
>Dunno where your formula for power came from; but think you really
>meant P (watts) = I * E
The formula is correct, but there seems to be the assumption that the
resistance would be the same, and of course it isn't.
Tom
>
>Your example above - 10 amps at 3 volts would be 30 watts; and
>10 amps at 208 volts would be 624 watts. There's no free lunch :)
>
>Take care.
>
>Ken
.
- References:
- Heating effect of AC vs DC
- From: Surfer
- Re: Heating effect of AC vs DC
- From: Ken Weitzel
- Heating effect of AC vs DC
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