1. What is a Capacitor Size Calculator?

Definition: This calculator determines the required capacitance (in farads) based on current, discharge time, and allowable voltage drop.

Purpose: It helps engineers and electronics enthusiasts select the appropriate capacitor for power supply filtering, energy storage, and timing applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( C \) — Capacitance (farads)
• \( I \) — Current (amps)
• \( t \) — Time (seconds)
• \( \Delta V \) — Allowable voltage drop (volts)

Explanation: The formula calculates the capacitance needed to supply a given current for a specified time while maintaining the voltage drop within acceptable limits.

3. Importance of Proper Capacitor Sizing

Details: Correct capacitor sizing ensures stable power supply, prevents voltage sag, and maintains proper circuit operation during current demands.

4. Using the Calculator

Tips: Enter the current in amps, time duration in seconds, and maximum allowable voltage drop in volts. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical voltage drop value?
A: For most applications, 0.1V to 0.5V is acceptable, but this depends on your specific circuit requirements.

Q2: How do I convert between farad units?
A: 1 farad = 1,000,000 μF (microfarads) = 1,000 mF (millifarads)

Q3: Does this work for both charging and discharging?
A: Yes, the formula applies to both scenarios, though real-world capacitors may have additional factors to consider.

Q4: What if I need to account for efficiency losses?
A: You may want to add 20-30% to the calculated value to account for capacitor ESR and other losses.

Q5: Can I use this for supercapacitors?
A: Yes, the formula works for all capacitor types, though supercapacitors typically have much higher capacitance values.