Resistor Type & Value for Connecting Diode to 12V: Proper Connection Methods

What kind of resistor should I put in to connect the diode under 12V and under which you can connect the resistor

Hello
Preferably 560? / 0.5W.
Anyway, what you will find from 500? to 1k?.
Which foot do you want.

R>= (U-0.7V) ÷ 15mA that is 11.3 ÷ 15mA = 0.75k? (750?
Use a resistor of at least 750 ?.
It is, of course, a light emitting diode, although you did not write it.

Practically, you can use from 470 ? to even 1 k? and a power of 0.5 W. A lot depends on the parameters of the diode, usually red diodes (2.1-2.5 V) are powered with a slightly lower voltage than green and yellow ones (2, 7-3.2V)

Szafa333 wrote:

Practically, you can use from 470 ? to even 1 k? and a power of 0.5 W. A lot depends on the parameters of the diode, usually red diodes (2.1-2.5 V) are powered with a slightly lower voltage than green and yellow ones (2, 7-3.2V)

Hello, where did you take such diode parameters
I have always thought that red is 1.6 1.7
yellow 1.8 1.9
green 2.0


I don't know, but I use the formula

Id = (U-Ud) / R


so I have U = 12V
Ud depending on the color of the led
Id rated current --- catalog but led ?5mm it is 25-20 mA
insert transform the formula calculate R.

greetings

Added after 1 [minutes]:

and as for the legs, it is neutral as long as the diode polarity is maintained

I remembered this data from school, Polish LEDs from the CQP, CQYP series
they had a voltage at the junction of about 2 V (red) and 3 V yellow and green. but
the technique is moving forward, so these data have probably become obsolete, but on the internet I found the following text:
"The characteristics of the LED are similar to those of a rectifier diode. Due to the large increase in the forward current value of the diode, with a slight increase in its forward voltage, a resistor is used in series with the LED. The LED has a slightly higher forward voltage, which is 2V for the red diode and 3V for the diode green and yellow. The LEDs have low blocking voltages ranging between 3 and 5V. The maximum forward current is 20 - 50mA, depending on the type of diode. "
Regards