How long does a resistor last? - sci.electronics.repair

Mensaje del debate How long does a resistor last?

Colin Trunt

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Más opciones 2 nov 2009, 08:58

Grupos de noticias: sci.electronics.repair, sci.electronics.design, sci.electronics.components

De: "Colin Trunt" <co...@trunt.com>

Fecha: Mon, 2 Nov 2009 11:58:05 -0000

Local: Lun 2 nov 2009 08:58

Asunto: Re: How long does a resistor last?

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"Dave Plowman (News)" <d...@davenoise.co.uk> wrote in message
news:50b2416ebcdave@davenoise.co.uk...

> In article <iDtGm.27$ei...@newsfe22.ams2>,
> Colin Trunt <co...@trunt.com> wrote:

>> "larry moe 'n curly" <larrymoencu...@my-deja.com> wrote in message
>> news:e18113f3-4a77-45b7-b885-8c3b76744dbd@h40g2000prf.googlegroups.com...
>> > 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?

>> It depends on what it is made of.
>> Also resistors are measured in ohms not watts.

> You must be lucky if you choose them without taking into account the
> current they're handling.

Not usually an issue.
Anyway I can allways stick in a resistor to drop the current
down to one it can handle. ;O)

Anyway if it lasts a day it should last a lifetime.

The usual solution is to add a heat sink.

> --
> *Caution: I drive like you do.

> Dave Plowman d...@davenoise.co.uk London SW
> To e-mail, change noise into sound.

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