1. What is the Wattage to Amps Calculation?

The wattage to amps calculation determines the electrical current (in amperes) drawn by a device or system based on its power consumption (in watts) and operating voltage. This is essential for sizing generators, circuit breakers, and wiring.

2. How Does the Calculator Work?

The calculator uses the electrical power formula:

For three-phase systems, the formula becomes:

Where:

• \( I \) — Current in amperes (A)
• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( \sqrt{3} \) — ≈1.732 (three-phase multiplier)

Explanation: The calculation converts power consumption to current draw, accounting for different electrical systems (single-phase vs three-phase).

3. Importance of Current Calculation

Details: Proper current calculation ensures generators and electrical systems are properly sized to handle the load without overheating or tripping breakers.

4. Using the Calculator

Tips: Enter power in watts, voltage in volts, and select the phase type. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is three-phase different?
A: Three-phase systems have three alternating currents that are phase-shifted, resulting in more efficient power delivery with lower current per conductor.

Q2: What's the difference between real and apparent power?
A: This calculator uses real power (watts). For AC systems with power factor considerations, apparent power (VA) may be needed.

Q3: How do I account for power factor?
A: For AC systems with known power factor, divide the result by the power factor (typically 0.8-1.0).

Q4: What about motor starting currents?
A: Motors can draw 3-8 times their rated current during startup. This calculator shows running current only.

Q5: Can I use this for DC systems?
A: Yes, the simple I=P/V formula works for DC. Just select single-phase and ignore the √3 factor.