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LED
Resistor
Single · Series · Parallel · Power & standard resistor suggestions
Single LED
Series
Parallel
Supply Voltage (Vs)
*
Volts (V)
LED Forward Voltage (Vf)
*
Volts (V)
LED Current (If)
*
Milliamps (mA)
Calculate
Example (5V, 2V, 20mA)
12V, 3V, 20mA
—
Ω
Required series resistor
Single LED
Calculated R
—
Ω
Suggested (E24)
—
Ω
E24
Voltage Drop
—
V
Power Dissipation
—
mW
💡
Vf:
2.0V
If:
20mA
Vs:
5V
R:
150Ω
Supply Voltage (Vs)
*
Volts (V)
LED Vf (each)
*
Volts (V)
LED Current (If)
*
Milliamps (mA)
Number of LEDs
*
Count
Calculate
12V, 3x 2V, 20mA
—
Ω
Required series resistor
Series
Calculated R
—
Ω
Suggested (E24)
—
Ω
E24
Total Vf
—
V
Power (R)
—
mW
💡
+
💡
+
💡
→
R
LEDs:
3
Vs:
12V
R:
—
Supply Voltage (Vs)
*
Volts (V)
LED Vf (each)
*
Volts (V)
LED Current (each)
*
Milliamps (mA)
Number of LEDs
*
Count
Calculate
5V, 3x 2V, 20mA
—
Ω
Resistor per LED (each branch)
Parallel
R per branch
—
Ω
Suggested (E24)
—
Ω
E24
Total Current
—
mA
Total Power
—
mW
💡
R
💡
R
💡
R
LEDs:
3
Vs:
5V
R each:
—