1. What is LED Current?

The LED current is the amount of electric current flowing through an LED when connected in a circuit with a voltage source and a current-limiting resistor. Proper current calculation is essential to prevent LED damage and ensure optimal brightness.

2. How Does the Calculator Work?

The calculator uses Ohm's Law adapted for LEDs:

Where:

• \( I \) — LED current (Amperes)
• \( V_s \) — Source voltage (Volts)
• \( V_{led} \) — LED forward voltage (Volts)
• \( R \) — Resistor value (Ohms)

Explanation: The equation calculates the current by subtracting the LED's forward voltage from the source voltage and dividing by the resistance.

3. Importance of Current Calculation

Details: Proper current calculation ensures LEDs operate within their specified current range, preventing premature failure while achieving desired brightness.

4. Using the Calculator

Tips: Enter source voltage in volts, LED forward voltage in volts, and resistor value in ohms. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is typical LED forward voltage?
A: Typically 1.8-3.3V depending on color and type (red ≈1.8V, white/blue ≈3.0-3.3V).

Q2: What happens if current is too high?
A: Excessive current can overheat and destroy the LED. Always use a current-limiting resistor.

Q3: How do I choose the right resistor?
A: Calculate based on desired current (usually 10-20mA for standard LEDs) using this formula.

Q4: Can I connect LEDs directly to a power source?
A: No, this will typically result in excessive current and immediate LED failure.

Q5: What if my calculated current is negative?
A: This means your source voltage is lower than the LED's forward voltage - the LED won't turn on.