this post was submitted on 24 Jan 2024
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Electrical and Computer Engineering
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The thing is LEDs are non-linear devices; they don't really follow Ohm's law and you can't measure the resistance with an ohmmeter.
If you want to sub a resistor to ensure the same current draw you could measure the LED current and voltage drop in circuit and then calculate what resistor to use in its stead.
I wouldn't worry about it, though. Most standard indicator LEDs run less than 20mA (because that's often their max rated current and to extend their lifetime, designs usually run LEDs well below that limit). I can't imagine any sane design that would blow up if that load wasn't present.
Yeah well that's what I get for giving electrical engineering advice with an electrician's education. I should go to school.