I have explained how to calculate the resistance value for LEDs for different input voltage. It is very important to select right series resistor before using a LED in a circuit otherwise the LED may burnout.

I will request you to watch the complete tutorial video of the LED Resistor calculation but you can also jump to any topic by click on the following Time Stamps:

00:34 How to identify forward voltage, current rating of LED from datasheet.

00:54 How to calculate resistance value for 9V input voltage (Ohm Law).

02:21 How to calculate the resistor wattage in the circuit.

04:59 How to select the resistance value for 12V input voltage.

I have shown how to identify the LED rating from the datasheet and from that rating how to calculate resistance value and wattage required to connect the led in a circuit using ohm law for different input voltages. After calculation the resistance value we have practically measured the voltage and current value with a multimeter and compare it with the calculated data.

Here I have used a 3V led and calculated the resistance value in 9 volts and 12-volt circuit.

I have explained how to calculate the resistance value for LEDs for different input voltage. It is very important to select right series resistor before using a LED in a circuit otherwise the LED may burnout.

I will request you to watch the complete tutorial video of the LED Resistor calculation but you can also jump to any topic by click on the following Time Stamps:

00:34 How to identify forward voltage, current rating of LED from datasheet.

00:54 How to calculate resistance value for 9V input voltage (Ohm Law).

02:21 How to calculate the resistor wattage in the circuit.

04:59 How to select the resistance value for 12V input voltage.

I have shown how to identify the LED rating from the datasheet and from that rating how to calculate resistance value and wattage required to connect the led in a circuit using ohm law for different input voltages. After calculation the resistance value we have practically measured the voltage and current value with a multimeter and compare it with the calculated data.

Here I have used a 3V led and calculated the resistance value in 9 volts and 12-volt circuit.

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