Find the correct current-limiting resistor to protect your LED.
e.g. 3.3, 5, 9, 12
Typical: Red 2V, Blue/White 3.2V
Typical: 10–20 mA
All share same current
Result
150 Ω
Nearest E12 standard value
Exact value
150.0 Ω
Actual current
20.0 mA
Power dissipated
60 mW
Total LED Vf
2V
Resistor ≥
0.25W (1/4W)