Enter the LED resistance (ohms), the LED current (amps), and the source voltage (volts) into the calculator to determine the LED Voltage.
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LED Voltage Formula
The following formula is used to calculate the LED Voltage.
Vled = Vs - R*I
- Where Vled is the LED Voltage (Volts)
- R is the LED resistance (ohms)
- I is the LED current (amps)
- Vs is the source voltage (volts)
To calculate the LED voltage, multiply the LED resistance by the current, then subtract the result from the source voltage.
How to Calculate LED Voltage?
The following example problems outline how to calculate the LED Voltage.
Example Problem #1
- First, determine the LED resistance (ohms). In this example, the LED resistance (ohms) is determined to be 16 .
- Next, determine the LED current (amps). For this problem, the LED current (amps) is measured to be 7 .
- Next, determine the source voltage (volts). In this case, the source voltage (volts) is found to be 2.
- Finally, calculate the LED Voltage using the formula above:
Vled = Vs – R*I
Inserting the values from above into the equation gives:
Vled = 17 – 7*2 = 3 (Volts)
FAQ
What factors affect LED voltage drop?
The LED voltage drop is primarily affected by the LED’s resistance and the current passing through it. The material of the LED and its temperature can also influence the voltage drop.
How can I increase the lifespan of my LEDs?
To increase the lifespan of LEDs, ensure they are operated within their recommended current and voltage ranges. Using a current-limiting resistor and avoiding high temperatures can also help prolong their life.
Can I connect multiple LEDs in series with a single resistor?
Yes, you can connect multiple LEDs in series with a single resistor, but all LEDs in the series will have the same current flowing through them. Ensure the power supply voltage is high enough to account for the total voltage drop across all LEDs plus the resistor.
