Resistor para LED
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
R led
About this calculator
The LED Resistor Calculator is a useful tool to determine the value of resistor required to protect an LED from short circuits. It is based on the formula R = (V_supply - V_LED)/I, where R is the resistance, V_supply is the supply voltage, V_LED is the LED voltage and I is the LED current.
This calculator is especially useful when you are designing a circuit with LEDs and need to ensure they are protected from short circuits. It helps to avoid damage to the LED and the circuit as a whole.
Additionally, this calculator is a practical tool to calculate the required resistance for an LED in different situations, such as when the supply voltage varies or when the LED current is different from the expected.
It is essential to remember that this calculator is only a supporting tool and that practice and experience are fundamental to design safe and efficient circuits.
Frequently asked questions
What is the formula used by the LED Resistor Calculator?
The formula used by the calculator is R = (V_supply - V_LED)/I, where R is the resistance, V_supply is the supply voltage, V_LED is the LED voltage and I is the LED current.
When to use this calculator?
This calculator is especially useful when you are designing a circuit with LEDs and need to ensure they are protected from short circuits. Additionally, it is useful for calculating the required resistance for an LED in different situations.
What is needed to use this calculator?
To use this calculator, you need to know the supply voltage, the LED voltage and the LED current.
What is a short circuit?
A short circuit is a condition in which the electric current flows freely through a circuit, which can cause damage to the LED and the circuit as a whole.