LED circuit schematic diagram
Supply voltage: V
LED current: mA
Color, Voltage drop: V
Number of LEDs:
Resistor precision:
Results:
10%   5%   2%   1%  
Nearest lower and higher 5% resistors:
Resistor color code Value LED current
330Ω 5% resistor lower:
330Ω
21.21 mA
360Ω 5% resistor higher:
360Ω*
19.44 mA
Calculated resistance:350Ω
Nearest lower 5% resistor:330Ω
Nearest higher 5% resistor:360Ω*
Power dissipated by the resistor:140 mW
Recommended resistor Wattage:1/4 W
Power consumed by the LED (PLED):40 mW
Total power consumption (PTotal):180 mW
Efficiency (PLED/PTotal) x 100 :22.22 %
LED series resistor calculator © hobby-hour.com