1. What is a Watts to Amps 3 Phase Calculator?

Definition: This calculator converts electrical power in watts to current in amps for three-phase systems.

Purpose: It helps electricians and engineers determine the current draw in three-phase electrical systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current (amps)
• \( P_w \) — Power (watts)
• \( V \) — Voltage (volts)
• \( PF \) — Power factor (unitless, between 0 and 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The power in watts is divided by the product of voltage, power factor, and square root of 3 to get the current.

3. Importance of 3 Phase Current Calculation

Details: Accurate current calculation ensures proper sizing of wires, circuit breakers, and other electrical components in three-phase systems.

4. Using the Calculator

Tips: Enter the power in watts, line voltage (default 480V), and power factor (default 0.85). All values must be > 0, and PF between 0.01 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: Why is √3 used in the formula?
A: The square root of 3 accounts for the phase difference in three-phase systems.

Q3: What's a typical power factor value?
A: For motors, 0.85 is common. Resistive loads have PF=1, while inductive loads have lower PF.

Q4: Is this for line-to-line or line-to-neutral voltage?
A: The formula uses line-to-line voltage (phase-to-phase voltage).

Q5: How does this differ from single-phase calculation?
A: Single-phase uses I = P/(V×PF) without the √3 factor.