Comprehensive Guide to Driving Two LEDs in Series
Connecting light-emitting diodes in a series configuration is a popular and efficient method in electronics circuit design. When two LEDs are wired in series, the current flowing through both components remains identical. This approach prevents discrepancies that often occur when parallel LEDs experience minor manufacturing variations in forward voltage drop.
Formula Used
The mathematical evaluation of the series circuit relies on Ohm's Law and Kirchhoff's Voltage Law. First, the total forward voltage is summed together: $V_{total\_vf} = Vf_1 + Vf_2$. Next, the voltage required to drop across the current-limiting resistor is computed as $V_{resistor} = V_{source} - V_{total\_vf}$. Finally, the required resistance is found via $R = V_{resistor} / I_{target}$, and power dissipation is evaluated using $P = I^2 \times R$.
How to Use This Calculator
Input your input power source parameters into the first column, followed by individual LED specifications in columns two and three. Click the submit button to review precise resistance requirements, voltage drops, and recommended wattage ratings instantly.
Frequently Asked Questions
- Can I use different colored LEDs in series? Yes, provided your source voltage exceeds the combined forward voltage drop.
- Why is resistor wattage important? It ensures the resistor does not overheat or burn out under load.
- What happens if source voltage is too low? The LEDs will fail to illuminate properly or remain completely dark.