Hi all,
I'm just experimenting with LED's to better understand the behaviour. The test i"m doing is putting as many high resistors in series with a LED to drop the voltage over the LED to 0V. The reason why is that in every circuit i made i'm always noticing that an LED (red led in my case) always has a minimum of 1.4 V as with other components (lightbulbs) i can reduce the voltage to 0 V
- When i put an LED in series with a Potmeter and a very high fixed resistor (for example 1 megaohm) the voltage on the LED never drops below 1.4 V (it's balancing on the edge between on - off, my lab voltage shows current = 1MA
- When i put a 6 V lightbulb in series with a Potmeter and a very high fixed resistor (for example 1 megaohm) i can reduce the voltage on lightbulb to +- 0V
Is my resistance not high enough so i can't get the voltage on the LED to 0 or is it normal that an LED can't go lower then his lowest voltage (depending on the color) ?
When i look at voltage current graphs on the internet i see that some graphs indeed show that the lowest voltage on the x-axis is 1.4V and some other graphs do show 0v as the lowest voltage.
Thx for the help
I'm just experimenting with LED's to better understand the behaviour. The test i"m doing is putting as many high resistors in series with a LED to drop the voltage over the LED to 0V. The reason why is that in every circuit i made i'm always noticing that an LED (red led in my case) always has a minimum of 1.4 V as with other components (lightbulbs) i can reduce the voltage to 0 V
- When i put an LED in series with a Potmeter and a very high fixed resistor (for example 1 megaohm) the voltage on the LED never drops below 1.4 V (it's balancing on the edge between on - off, my lab voltage shows current = 1MA
- When i put a 6 V lightbulb in series with a Potmeter and a very high fixed resistor (for example 1 megaohm) i can reduce the voltage on lightbulb to +- 0V
Is my resistance not high enough so i can't get the voltage on the LED to 0 or is it normal that an LED can't go lower then his lowest voltage (depending on the color) ?
When i look at voltage current graphs on the internet i see that some graphs indeed show that the lowest voltage on the x-axis is 1.4V and some other graphs do show 0v as the lowest voltage.
Thx for the help