LED Resistor Calculator

Voltage Source (V):


Voltage Drop Across LED (V):


Current Through LED (mA):



Calculate LED Resistor

Result:

 

LED Resistor Calculator

LEDs (Light Emitting Diodes) are popular components in electronics due to their energy efficiency and versatility. When using LEDs, it’s essential to ensure they are operated within safe operating conditions. One crucial aspect of this is determining the appropriate resistor value to limit the current passing through the LED. Our LED Resistor Calculator simplifies this process, allowing you to find the ideal resistor value for your LED circuit.

Understanding LED Circuit Parameters

Before using the LED Resistor Calculator, it’s important to understand the key parameters involved:

1. Voltage Source (V): This is the voltage supplied to the LED circuit.
2. Voltage Drop Across LED (V): LEDs have a specific voltage drop requirement, typically mentioned in their datasheet.
3. Current Through LED (mA): The desired current passing through the LED, usually specified in milliamperes (mA).

Using the LED Resistor Calculator

To use the LED Resistor Calculator effectively, follow these steps:

1. Enter the voltage source value (V) in the designated field.
2. Input the voltage drop across the LED (V).
3. Specify the desired current through the LED (mA).

Click the “Calculate” Button

Click the “Calculate LED Resistor” button, and the calculator will instantly provide you with the LED resistor value required for your circuit. The calculator takes into account Ohm’s law (V = I * R) to determine the resistor value that will limit the current through the LED appropriately.

Example Calculation

Let’s say you have a circuit with a voltage source of 5V, an LED with a voltage drop of 2V, and you want a current of 20mA to pass through the LED. Plugging these values into the calculator yields:

LED Resistor Value (R) = (Voltage Source – Voltage Drop) / (Current Through LED / 1000) LED Resistor Value (R) = (5V – 2V) / (20mA / 1000) = 150 ohms

So, for this example, a 150-ohm resistor would be ideal to limit the current through the LED to 20mA.

Conclusion

The LED Resistor Calculator simplifies the process of finding the right resistor value for your LED circuit. It ensures that your LEDs operate within safe current limits, preventing potential damage and ensuring optimal performance. By inputting the voltage source, LED voltage drop, and desired current, you can easily determine the correct resistor value needed to create a successful LED circuit. This tool is a valuable asset for both beginners and experienced electronics enthusiasts alike.