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LED Parallel Resistor Formula:
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The LED parallel resistor calculation determines the equivalent resistance when multiple LEDs are connected in parallel with individual resistors. This helps in designing proper current-limiting circuits for LED arrays.
The calculator uses the parallel resistance formula:
Where:
Explanation: When identical resistors are connected in parallel, the equivalent resistance is the individual resistance divided by the number of resistors.
Details: Proper resistor calculation ensures each LED receives the correct current, prevents overcurrent damage, and maintains consistent brightness across all LEDs in the parallel array.
Tips: Enter the resistor value in ohms (Ω) and the number of LEDs in the parallel circuit. All values must be valid (resistance > 0, LED count ≥ 1).
Q1: Why use individual resistors for each LED?
A: Individual resistors ensure current sharing and prevent current hogging, where one LED might draw more current than others due to manufacturing variations.
Q2: What happens if I use a single resistor for multiple parallel LEDs?
A: Using a single resistor can lead to uneven current distribution, potentially causing some LEDs to be brighter than others or even fail prematurely.
Q3: How do I calculate the individual resistor value?
A: Use Ohm's law: R = (Vsource - VLED) / ILED, where VLED is the LED forward voltage and ILED is the desired current.
Q4: Can I mix different colored LEDs in parallel?
A: It's not recommended as different colored LEDs have different forward voltages, which would require different resistor values for proper current regulation.
Q5: What's the maximum number of LEDs I can connect in parallel?
A: The limit depends on your power supply's current capacity and the thermal considerations of your circuit design.