i want to measure current and volt at maximum power by changing the load resistance using potentiometer.Get out your credit card. They're not cheap.
There are better ways to make a dummy load. What are you trying to do?
actually i bought this potentiometer http://sa.rsdelivers.com/catalogue/category/potentiometers/10187.aspx#|A-368990| it was written in its datasheet that it handle max 200 vdc and my pv panel give max 34 volt 4.7 amp . when i connected it , its heat increased .Why do you want to do this?
Is the 20-ohm pot rated to handle 150W ?
that's a $30 pot rated at 1W. No, it won't work, and hopefully you haven't already burned it up.actually i bought this potentiometer http://sa.rsdelivers.com/catalogue/category/potentiometers/10187.aspx#|A-368990| it was written in its datasheet that it handle max 200 vdc and my pv panel give max 34 volt 4.7 amp . when i connected it , its heat increased .
will that give me a control in resistance around 20 ohm ?how about parallel a few mosfets on an extruded aluminum heat sink and operate them in linear mode?
why won't it work ?that's a $30 pot rated at 1W. No, it won't work, and hopefully you haven't already burned it up.
you want to dissipate 150W. your pot is rated 1W. you will need a pot with 15,000% higher power rating than the one you have.why won't it work ?
so what to do ? isn't there resistors with high power ratings , i will also need another one when connecting dc-dc converter.you want to dissipate 150W. your pot is rated 1W. you will need a pot with 15,000% higher power rating than the one you have.
Ka-POW! that's a shot in the pocket book.Here is what you need:
http://www.newark.com/ohmite/rns25re/rheostat-wirewound-25-ohm-300w/dp/64K5908
it's very expensive to me , isn't there simple solution ?Here is what you need:
http://www.newark.com/ohmite/rns25re/rheostat-wirewound-25-ohm-300w/dp/64K5908
Light bulbs.it's very expensive to me , isn't there simple solution ?
will i get the required resistance around 20 ohm ? i need to change it by 1 ohm .Or get a whole bunch of 12V automotive headlight lamps and wire them in series/parallel combination.