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

Car Speed limit Alarm
Home Security System
Battery Level Monitor Circuit
gps altimeter
model railway short circuit
Stereo Tone Control
FM Tracking Transmitter
El-Cheapo Fluoro Ballast
Power switching circuits
AUDIBLE LIGHT METER
LONG PERIOD TIMER
SDR TX 50MHz



Top