In message , Colin Trunt
writes

"larry moe 'n curly" wrote in message
...
When run at its rated power?

I'm referring to 1/4 - 10 watt resistors in TVs and PC power supplies,
probably in 30-50 Celcius surrounding air.

I thought that resistors were supposed to be chosen for twice the
actual power, but I've seen many 0.5W to 1.0W resistors run at almost
exactly their rated power continuously.

Serious question?

I don't know if it is a 'serious' question, but it seems to be a
perfectly 'sensible' question.

It depends on what it is made of.
Also resistors are measured in ohms not watts.
Genereally speaking the 1/2 life of the material is a good clue
as to when it#s resistance will have doubled.
SO don't use anything to radioactive.
A typical value would be a million triilion years, if it
fails before them take it back to the shop :O)

Is this a misguided attempt at humour, or have you really not the
slightest idea what you're talking about?

I suspect that the answer is very similar to that to "How long is a
piece of string", but maybe there is someone who is prepared to venture
a reasoned answer.
--
Ian