LED Resistor Calculator
An LED (Light Emitting Diode) requires a current-limiting resistor to prevent excessive current, which could damage the LED. This resistor drops the voltage difference between the power supply and the LED's forward voltage
How the calculation works
Supply Voltage (Vsupply): The voltage of your power source.
LED Forward Voltage (Vf): The voltage drop across the LED when it is turned on (usually between 1.8V
and 3.3V depending on the LED type).
LED Current (ILED): The desired current through the LED, typically 10-20 mA.
The resistor value (R) is calculated using Ohm's Law:
\[ R = \frac{V_{\text{supply}} - V_{f}}{I_{\text{LED}}} \]
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Disclaimer: These calculators are provided for informational purposes only. Always verify your designs against relevant engineering standards and consult a qualified professional. We do not take responsibility for any errors or damages resulting from the use of these calculations.