Why do you need a resistor for an LED?

LEDs (Light Emitting Diodes) are sensitive components. If you connect them directly to a battery without a resistor, they will draw too much current and burn out instantly (Thermal Runaway).

This calculator uses Ohm's Law to find the exact series resistor value to limit the current, ensuring your LED shines brightly and lasts safely.

Formula Used: R = (Source Voltage - LED Voltage) / Current