1. What is Electrical Load Calculation?

Definition: This calculator determines the power consumption in a 3-phase electrical system based on voltage, current, and power factor.

Purpose: It helps electricians and engineers properly size electrical systems and components.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Power in watts
• \( V \) — Line voltage in volts
• \( I \) — Current in amps
• \( PF \) — Power factor (0 to 1)
• \( \sqrt{3} \) — Constant for 3-phase systems

Explanation: The formula calculates the real power in a balanced 3-phase AC circuit.

3. Importance of Load Calculation

Details: Accurate load calculations prevent circuit overloads, ensure proper equipment sizing, and maintain electrical system safety.

4. Using the Calculator

Tips: Enter the line voltage (V), current (I), and power factor (default 0.8). Power factor must be between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is converted to useful work.

Q2: What's a typical power factor value?
A: For most industrial loads, power factor ranges from 0.8 to 0.95. Residential may be lower (0.7-0.9).

Q3: Why is √3 used in the formula?
A: The √3 accounts for the phase difference in 3-phase systems (120° between phases).

Q4: Is this for single-phase or 3-phase?
A: This calculator is specifically for balanced 3-phase systems.

Q5: How do I find the current if I only know power?
A: Rearrange the formula: \( I = \frac{P_w}{V \times PF \times \sqrt{3}} \)