Electronics > Beginners

Using a small resistor in some water instead of a power resistor?

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Kleinstein:
Precision is not that critical for power sharing. Even of some resistors are 10% off they get some 10% more or less than the average. Not much difference in parallel and series connection.

One may have to include the thermal coupling: so 4 resistors with 1/4 W placed close together can not dissipate 1 W. Especially with SMD resistors it needs quite some board space to get the nominal power rating.

MLXXXp:

--- Quote from: help_me_pick_username on November 02, 2019, 10:08:46 pm ---isn't there this thing when you put multiple resistors in parallel, the current will just go through the one that has the least resistance...?

--- End quote ---

No. If one is slightly lower, it will conduct slightly more current and use slightly more power but only proportional to the percentage of the difference. You might be thinking of diodes.

MLXXXp:
https://phys.libretexts.org/Bookshelves/University_Physics/Book%3A_University_Physics_(OpenStax)/Map%3A_University_Physics_II_-_Thermodynamics%2C_Electricity%2C_and_Magnetism_(OpenStax)/10%3A_Direct-Current_Circuits/10.2%3A_Resistors_in_Series_and_Parallel

help_me_pick_username:

--- Quote from: MLXXXp on November 02, 2019, 10:14:20 pm ---You might be thinking of diodes.

--- End quote ---

I think I was thinking of diodes. Thanks for the clarification!

schmitt trigger:
This can easily become Photonicinduction - worthy experiment.

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