LED Voltage Drop Fluctuation: Investigating the Cause

[asa!!]

hi i have fixed a simple circuit for lighting up a led.i have included a potentiometer. as the led is white i know that the voltage drop of the led is around 4v.when the potentiometer is at min resistance the voltege drop is actuallu around 3.8v.the problem is that when i turn the potentiometer at maximum resistance the drop is around 2.5v.I thought that the voltage drop is steady for each led and does not fluctuate.could anyone explain me why that happens?thank you

 

[berkeman]

hi i have fixed a simple circuit for lighting up a led.i have included a potentiometer. as the led is white i know that the voltage drop of the led is around 4v.when the potentiometer is at min resistance the voltege drop is actuallu around 3.8v.the problem is that when i turn the potentiometer at maximum resistance the drop is around 2.5v.I thought that the voltage drop is steady for each led and does not fluctuate.could anyone explain me why that happens?thank you

Please post a link to the datasheet for your LED. If you can't figure out the Vf specs, we can help you do that.

 

[ravenprp]

There could be a few reasons for the voltage drop fluctuation in your LED circuit. One possibility is that the potentiometer itself has some resistance which could affect the overall voltage. Another possibility is that the LED itself may not have a consistent voltage drop due to manufacturing variations. Additionally, the power supply or other components in the circuit could also introduce fluctuations in the voltage. It's important to check all components and connections to ensure they are functioning properly and not causing any voltage fluctuations. You may also want to consider using a more precise potentiometer or a voltage regulator to help stabilize the voltage drop.