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LED Resistor Calculator | Required Value of Resistor for LED’s Circuit Calculator

LED Resistor Calculator | Required Value of Resistor for LED’s Circuit Calculator

LED Resistor Calculator

This LED Resistor
calculator will help you to find the proper value of resistor for LED’s circuit
to connect with battery.
Formula for this
calculator
Resistor Value = (Vs – VF)/ IF
Where
Vs = Input Supply DC voltage
VF = LED Forward Voltage
IF = LED current in mA (mill amperes)
If you want to know more about how to calculate the
Resistors values for different LED’s circuit i.e., series, parallel, and series
parallel, then read this interesting Article about the Topic.
Note: It is too
difficult to find the exact value of resistors that you have calculated. Generally,
Resistors come in standard values. If you are not able to find the exact value
of resistor that you have calculated, then select the next coming value of
resistor that you have calculated, For Example, if the calculated value is
313.5Ω, you would use the closest standard value, which
is 330 Ω. if the closest value is
not close enough, then you can make it by connecting resistors in series –
parallel configuration.
Update: you can also try
this calculator Standard Resistor Closest Value Calculator instead of the above method stated in “note”.

Enter values and click on calculate. Result will display the required value of Resistor in Ohms (Ω).

 Enter your values:
 Source Voltage (Vs): V (Volts) Forward LED voltage (VF): V (Volts) LED Current (IF): mA (miliAmps)

Output
 Resistor Value: Ω (Ohms)

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5 comments

1. If there is no resistor and supplied a source voltage greater than forward voltage, what will happen to voltage between i)a LED? ii) a Diode? or iii) BE junction of a transistor?<br />

2. kashif husssain

calculater gives us result 33.3e+5 what mean by this plz understand me

• Its mean 33.3 x 10^5 = 3330000 = 3.3M Ohm

3. Does this calculator work for rectified AC source voltages ?

4. PLEASE I NEED A DIAGRAM TO WIRE 200 GROW led 2.2, AND 3.3 VOLT 3 WATT ..
THANKS