how to calculate resistor for LED? | from which semiconductor material LED is made?

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HOW TO CALCULATE RESISTOR FOR LED? | FROM WHICH SEMICONDUCTOR MATERIAL LED IS MADE?

 

HELLO FRIENDS.

 

The chart of color of LED & material used is given below:-

 

The color of LED maters in calculation of resistance of LED.

 

A reference table is given below for different color LEDs.

 

This table is used for the calculation of resistance for LED, but different manufacturers make LEDs, so the voltage rating is also different.

To know voltage of a LED there are two ways:-

·       DATASHEET

·       MULTIMETER

 

But sometimes datasheets are not easy to find, of different manufacturers.

So best way to find voltage is multimeter.

 

HOW TO FIND VOLTAGE WITH THE HELP OF MULTIMETER?

 

To find voltage through multimeter:-

·       First make a small circuit in which, you will need a battery, a resister & the LED which you have to check.

·        Connect positive of battery to one end of resistor, and other leg of resistor to LED’s positive. At last negative of LED to negative of battery.

·       IMPORTANT:- if you use 9v battery, use atleast 330Ω resistor. Resistor in this circuit is used to just protect the LED from getting damaged.

·       Now connect the probes of multimeter to positive & negative leg of LED, and check the voltage of LED.

TO CALCULATE THE RESISTOR USED FOR LED:-

 

For calculate the resistor to use for LED:-

·       We have to see input voltage, LEDs voltage & current consumed by the LED(Average current consumed by LEDs are 30mA.).

·       Suppose we have input voltage=9v,

                                   LED voltage=1.5V.

          Current consumed by LED=30mA.

∴ RLED= INV- LEDV/ILED.

∴ RLED= 9V- 1.5/30mA.

∴ RLED= 7.5/30mA.

∴ RLED= 7.5×1000/30A. (mili amps to Ampere)

∴ RLED= 7500/30A.

∴ RLED= 250Ω. (this type of values are not available, so we have to use nearby value, for example 220Ω or330Ω).

 

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