6.5 Choosing the Right Resistor for an LED
To calculate the resistor for an LED, we need to know the forward voltage for the
LED, LEDs are different from the resistors, we need to limit the current passing through it
because it does not work on Ohm’s law.
We need to know the voltage around the LED. Usually, a 5 mm LED needs 15 - 30
mA to be in good lighting. After knowing the forward voltage for the LED, it is easy to
calculate the resistance.
To measure the forward voltage we connect a high value resistor, so we ensure that
a low current will pass through the LED.
To Next Page
Loading...
