Re: calculation of the limit current through a potentiometer
- From: John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 10 Dec 2006 11:29:54 -0800
On 10 Dec 2006 07:39:11 -0800, cedric_libre@xxxxxxxx wrote:
Hi,
I'd like to know if the maximum power dissipation is linear with the
resistance when using a potentiometer?
For instance, I use a 0.25 W potentiometer of 1k Ohm and I set its
resistance to 500 Ohm.
Between the two contacts where the resistance is 500 Ohm, will it be
able to dissipate 0.25 W or only 0.125 W ( (500/1000)*0.25 ) ?
If so, then to each potentiometer would correspond a certain current
limit .
Have you an idea ?
Thanks for your help,
Cédric
Check the wiper current rating. Often it's so low that overall power
dissipation isn't the limiting factor.
John
.
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