1. What is Full Load Current?

Full load current is the maximum current that a transformer can supply to its secondary winding when operating at its rated power and voltage. It's a critical parameter for transformer sizing and protection.

2. How Does the Calculator Work?

The calculator uses the basic power formula:

Where:

• \( I \) — Current in amperes (A)
• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)

Explanation: This simple formula calculates the current drawn by a load when the power and voltage are known.

3. Importance of Current Calculation

Details: Calculating full load current is essential for proper transformer selection, circuit breaker sizing, and ensuring safe operation of electrical systems.

4. Using the Calculator

Tips: Enter power in watts and voltage in volts. Both values must be positive numbers. The calculator will compute the current in amperes.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula valid for both AC and DC?
A: For DC systems, this formula is exact. For AC systems, it gives apparent current (for real power and RMS voltage).

Q2: What about three-phase systems?
A: For three-phase systems, the formula becomes \( I = P / (V \times \sqrt{3} \times PF) \) where PF is power factor.

Q3: Why is full load current important?
A: It helps determine the proper wire size, circuit protection, and ensures the transformer won't be overloaded.

Q4: What's the difference between full load and inrush current?
A: Full load current is steady-state, while inrush current is the temporary surge when first energizing a transformer.

Q5: How does efficiency affect the calculation?
A: For more precise calculations, divide the power by the efficiency to get input power: \( I = P / (V \times efficiency) \).