|
 |
Am 02.08.2010 22:32, schrieb gregjohn:
> clipka<ano### [at] anonymous org> wrote:
>> Am 31.07.2010 22:36, schrieb Orchid XP v8:
>>
>>>> 1 Joule is also the energy transformed in heat in 1 second by a 1 Ohm
>>>> resistor when the current is 1 ampere.
>>>
>>> And here I was thinking that the heat produced depends on the
>>> characteristics of the material, not just the current...
>>
>> In a sense that's true - but the material characteristics influence the
>> resistance /exactly/ the same way as the heat produced ;-)
>>
>
>
> Heat is heat is heat. If heat is generated, heat is generated. Don't confuse
> that with _temperature_ . The temperature that objects rise to will depend on a
> number of properties, starting with _heat_capacity_ and eventually influenced
> by _thermal_conductivity_ , convection currents in the neighborhood, etc.. A 1
> Ohm aluminum and 1 ohm tungsten wire will warm up differently, even if the same
> heat were generated.
Don't worry, I'm not confusing these things here. I guess Andy has
gotten the point I intended to make: "Sure, there are experimental
setups where the heat generated by a sample resistor at a given current
depends on the material characteristics - but you're forgetting that
those experiments don't have a constant resistance either."
Not really contradicting what you say, is it?
Post a reply to this message
|
|
