LED Resistor Calculator

How LED Resistor works

For LED Resistor, use R = voltage drop ÷ LED current. LED Resistor uses Supply minus LED voltage, LED current to report Series resistance.

With the loaded values, series resistance evaluates to 350.00 Ω. Test supply minus led voltage separately and preserve the baseline series resistance. For equivalent inductance, use Parallel Inductor Calculator.

Inputs for LED Resistor

Supply minus LED voltage and LED current belong to LED Resistor. Keep source units with supply minus led voltage.

The LED Resistor defaults demonstrate arithmetic only. Replace supply minus led voltage with case-specific data. Use Capacitor Charging Calculator.

Supply minus LED voltage

Example entry: 7 V.

LED current

Example entry: 0.02 A.

Reading the LED Resistor result

This output represents LED Resistor.

Before selecting equipment for LED Resistor, compare series resistance with available ratings and operating limits.

Measurement and units

Use component tolerances, voltage ratings, current limits, frequency behavior, and thermal data from the selected parts. Check prefixes on supply minus led voltage.

Keep the supply minus led voltage unit and measurement point consistent across LED Resistor cases.

Limits of this calculation

Choose a resistor power rating with margin. Compare this result with MOSFET Switching Loss Calculator when switching loss is also needed.

Only the listed LED Resistor inputs contribute to series resistance. Unentered effects remain outside LED Resistor.

A useful LED Resistor comparison

Save the initial series resistance before adjusting supply minus LED voltage. A low and high case is more informative than adding an unexplained safety factor after the calculation.

Document the alternate supply minus led voltage source.

LED Resistor record notes

Record source and operating details for supply minus led voltage.

Retain raw series resistance beside its selected rating.