1. What is a Diode Voltage Calculator?

Definition: This calculator determines the voltage across a diode in a simple series circuit with a resistor.

Purpose: It helps electronics engineers, students, and hobbyists analyze basic diode circuits and understand voltage distribution.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V_d \) — Voltage across the diode (volts)
• \( V_{supply} \) — Power supply voltage (volts)
• \( I \) — Current through the circuit (amps)
• \( R \) — Series resistance (ohms)

Explanation: The formula calculates the voltage drop across the diode by subtracting the voltage drop across the resistor from the supply voltage.

3. Importance of Diode Voltage Calculation

Details: Proper diode voltage calculation ensures correct biasing of diodes in circuits, prevents damage from excessive reverse voltage, and helps in designing proper voltage regulation systems.

4. Using the Calculator

Tips: Enter the supply voltage in volts, current in amps, and resistance in ohms. Current and resistance must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for the diode's forward voltage drop?
A: No, this calculates the theoretical voltage. Actual diode voltage would be lower by its forward voltage (typically 0.7V for Si diodes).

Q2: What if I get a negative diode voltage?
A: A negative result suggests the diode would be reverse-biased in this circuit configuration.

Q3: Can I use this for LED circuits?
A: Yes, but remember LEDs typically have higher forward voltages (1.8-3.3V depending on color).

Q4: How do I find the current if I don't know it?
A: Use Ohm's Law: I = (V_supply - V_d)/R, but you'll need to estimate V_d first.

Q5: Does this work for AC circuits?
A: Only for DC analysis. AC circuits with diodes require more complex analysis due to rectification effects.