Led Resistance Calculator

 

Online electrical calculator to measure the resistance of a LED resistor circuit using the Ohm's Law.

Source Voltage: Volts
Voltage Drop: Volts
Forward Current: MiliAmps
 
 

LED Resistance: Ohms
 




 

The formula to calculate the resistance is:

 
 

The following circuit explains the formula.

 

 




Where power supply voltage (Vs) is the voltage of the power supply, e.g. a 9 volt battery, LED voltage drop (Vf) is the forward voltage drop across the LED, and LED current (I) is the desired current of the LED. The above formula requires the current in amperes, although this value is usually given by the manufacturer in milliamperes, such as 20 mA.

 


 


Popular Circuits

RF based Automatic meter reading
Divide-multiply-with-only-one-trim
Loop Antenna For 3.5 Mhz
Attiny2313 based LAN cable tester
hand wired overdrive pedal
toggle switch using 555
nicad battery charger uses
MC33374 high power voltage switching regulator
4 Channel Tranceiver
AN7522 circuit diagram
Variable resistive phase-shift trigger circuit ab



Top