Series LED Current Limiting Resistor Calculator is an online electronic tool to measure How much total power dissipation would occur on the series connection of LEDs. The Light emitting diode often abbreviated as LED; is a PN junction solid state semi-conductor device emits light when current passing through it. Current Limiting resistor and resistance wattage are the two major aspects to calculate and avoid the LED from damaging. When it comes to online calculation, this Series LED Resistance Calculator can assist you to find out the values based on the input values of source voltage, voltage drop across LED, desired LED current and number of LEDs connected in series