Re: [[EE] Resistor power rating

Thanks for that.   It seems that a 5w wirewound resistor wold easily meet
my requirements
__________________________________________
David C Brown
43 Bings Road
Whaley Bridge
High Peak                           Phone: 01663 780582
Derbyshire                eMail: [email protected]
*SK23 7ND          web: www.bings-knowle.co.uk/dcb
<http://www.jb.man.ac.uk/~dcb> *



*Sent from my etch-a-sketch*


On Mon, 8 Dec 2025 at 22:22, Clint Jay <[email protected]> wrote:

> Vishay and Bourns both have info on their wesbites about selecting
> resistors for pulse load applications:
>
>
> https://www.vishay.com/docs/48516/_ms9702509-2401-vishaychecklistpulseload.pdf
> https://www.bourns.com/products/resistors/pulse-power-resistors
>
> On Mon, 8 Dec 2025 at 19:32, Jason White <
> [email protected]>
> wrote:
>
> > vishay makes some nice pulse rated 2512's that have some graphs where you
> > can look this up in
> >
> > On Mon, Dec 8, 2025 at 2:09 PM David VanHorn <[email protected]>
> wrote:
> >
> > > Normally, resistor power ratings assume 100% duty cycle, so 1/0.016
> would
> > > be a first approximation, but the part may not be capable of
> withstanding
> > > that much pulsed power.
> > > Unfortunately, the low duty cycle ratings are hard to find on most
> > > resistors.
> > >
> > >
> > > On Mon, Dec 8, 2025 at 11:37 AM David C Brown <[email protected]>
> > wrote:
> > >
> > > > I am planning to use a 2R2 resistor to limit the current to a
> solenoid
> > to
> > > > 6amps.
> > > > Ohms law says that the power dissipation is about 80watts.
> > > >
> > > > But the duration of the current pulse is only 16mS.   Does that mean
> > > that I
> > > > can get away with a lower power rating and, if so, how much lower?
> > > > __________________________________________
> > > > David C Brown
> > > > 43 Bings Road
> > > > Whaley Bridge
> > > > High Peak                           Phone: 01663 780582
> > > > Derbyshire                eMail: [email protected]
> > > > *SK23 7ND          web: www.bings-knowle.co.uk/dcb
> > > > <http://www.jb.man.ac.uk/~dcb> *
> > > >
> > > >
> > > >
> > > > *Sent from my etch-a-sketch*
> > > > --
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> > Jason White
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> Clint. M0UAW IO83
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