Calculate resistor for LED
This tool is designed to simplify the process of determining the required resistor value when connecting an LED to a power source. Simply enter the LED and power supply parameters and the calculator will provide you with the optimal resistor value, ensuring a safe and efficient LED connection.
Why is a resistor needed for an LED?
LEDs usually have a specific operating voltage (for example, 2-3 volts). Connecting the LED directly to a power source can result in excessive current, which can damage the LED. A resistor is included in the circuit to limit the current, providing safe and stable electrical power to the LED.
To choose the appropriate resistor, it is necessary to take into account the voltage and current of the LED, as well as the voltage of the power supply.
What happens to the LED without a resistor?
Connecting an LED to a power source without a resistor can lead to excessive current, which will cause the LED to overheat. This can result in damage or even the LED breaking due to thermal overheating.
If the resistor in the LED circuit has too high resistance.
High resistance of the resistor leads to a limitation of the current that flows into the LED. This can make the LED dim or even make it appear turned off. LEDs usually operate at certain current levels, and if the current becomes too low due to high resistance, the LED will not work at full brightness.
What type of resistor is suitable for LEDs?
Any type of resistor will work for the LED, the main thing is that the power and working voltage of the resistor correspond to the minimum parameters. Our calculator calculates all the necessary parameters.
If you don't have a suitable resistor.
Find the appropriate combination of resistors. We have a tool that will help you find the appropriate combination of resistors.