1. What is the Watts to Amps Calculation?

The Watts to Amps calculation is a fundamental electrical formula that determines the current flow in a circuit based on power and voltage. It's essential for sizing generators, circuit breakers, and wiring in electrical systems.

2. How Does the Calculator Work?

The calculator uses Ohm's Law for power:

Where:

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

Explanation: This formula shows the direct relationship between power, voltage, and current in a DC circuit or AC circuit with unity power factor.

3. Importance of Current Calculation

Details: Accurate current calculation is crucial for selecting appropriate generator sizes, circuit protection devices, and conductor sizes to prevent overheating and ensure safe operation.

4. Using the Calculator

Tips: Enter power in watts and voltage in volts. Both values must be positive numbers. For AC systems, this calculation assumes resistive loads (power factor = 1).

5. Frequently Asked Questions (FAQ)

Q1: Does this work for both AC and DC systems?
A: Yes, but for AC systems with reactive loads, you need to consider power factor (I = P/(V × PF)).

Q2: How do I account for three-phase systems?
A: For three-phase: I = P/(V × √3 × PF). Use line-to-line voltage and include power factor.

Q3: What's the difference between real power and apparent power?
A: Real power (watts) does actual work, while apparent power (VA) includes reactive power. This calculator uses real power.

Q4: Why is my generator rated in kVA not kW?
A: Generators are often rated in kVA (apparent power) because it represents total current-carrying capacity regardless of power factor.

Q5: How much headroom should I add to my calculations?
A: For safety, add 20-25% to your calculated current to account for startup surges and future expansion.