Led And Resistor

Using 220 Ω Resistor & 5 Volts

Vcc LED Forward Voltage Current Watt
5V 1.0V 18mA 0.072
5V 1.85V 15mA 0.048
5V 2.2V 13mA 0.038
5V 2.5V 11mA 0.028

Using 220 Ω Resistor & 2.2 Forward Voltage

Vcc LED Forward Voltage Current Watt
3V 2.2V 4mA 0.003
4.5V 2.2V 10mA 0.023
5V 2.2V 13mA 0.036
6V 2.2V 17mA 0.065
- - Excessive
Current
-
9V 2.2V 31mA 0.211
- - - Excessive
Power
Overheating
Possible
12V 2.2V 45mA 0.441

Ideal setup using 2.2 Forward Voltage & 20mA Current

Vcc Resistance Watt (resistor)
3V 40 ohms 0.016
3.3V 55 ohms 0.022
3.7V 75 ohms 0.030
4.5V 115 ohms 0.046
5.0V 140 ohms 0.056
5.5V 165 ohms 0.066
6.0V 190 ohms 0.076
6.3V 220 ohms 0.090
9.0V 340 ohms 0.136
12.0V 490 ohms 0.196
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