Electronics > Beginners
Using a small resistor in some water instead of a power resistor?
help_me_pick_username:
--- Quote from: schmitt trigger on November 02, 2019, 10:57:19 pm ---This can easily become Photonicinduction - worthy experiment.
--- End quote ---
What's photoinduction?
Jwillis:
Immersing resistors to increase the wattage ? I would be concerned about possible steam developing in any cracks or pours causing a small explosion destroying the resistor. I would be more inclined to use thermal adhesive and glue some heat sinks to the resistor if I didn't have enough to parallel as MLXXXp and Kleinstein suggested.
Its Photonicinduction https://www.youtube.com/channel/UCl9OJE9OpXui-gRsnWjSrlA
ejeffrey:
I once used a 1/4 W axial resistor as a 10 watt heater... Immersed in liquid nitrogen. Of course as soon as the nitrogen boiled off it turned into a fuse.
AVGresponding:
--- Quote from: ejeffrey on November 03, 2019, 02:57:07 am ---I once used a 1/4 W axial resistor as a 10 watt heater... Immersed in liquid nitrogen. Of course as soon as the nitrogen boiled off it turned into a fuse.
--- End quote ---
:-DD Good thing nitrogen is relatively inert...
Liquid cooled resistors are a thing. Here are a couple of links, for the curious:
https://en.wikipedia.org/wiki/Liquid_rheostat
https://www.danotherm.com/power-resistors/cooling-method/liquid-cooled
SeanB:
I used to use a cup of water and a 2N3055 as a dummy load, using a resistance box to vary the base current to get the desired current flow. Was small, and the water would generally last longer than the 5 minutes I needed to do the testing, plus you could always add a little more if needed when running low. 5V rail, so not too much worry about corrosion, and in any case you could use old transistors that are not good for other uses, or where you replaced one of a matched pair.
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