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

Reverse RIAA Equaliser
Active Antenna
Voltage controlled ramp generator
Simple Audio-Frequency Vco
BC337 Light Relay Switch By BC547 &
simple electronic organ
Several questions and countermeasures in the high-pressure frequency converter is employed
Low-Cost Quad Op Amp Drives RF Modulator
ac Validate Triac circuit
S1D15G10 Nokia LCD
How to design 65nm FPGA DDR2 memory
Power Amplifier Mini 2W+2W by TBA820M
Electronic Peacock by the CD4017 NE555 circuit diagram consisting of the opening screen