1. What is the Power Equation?

The power equation (P = V × I) calculates electrical power in watts from voltage and current. This fundamental relationship is essential for sizing generators and electrical systems.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

• \( P \) — Power in Watts (W)
• \( V \) — Voltage in Volts (V)
• \( I \) — Current in Amperes (A)

Explanation: The equation shows the direct proportional relationship between voltage, current, and power in electrical systems.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for proper generator sizing, circuit protection, and ensuring electrical systems operate within safe limits.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers for valid calculations.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between real power and apparent power?
A: This calculator gives real power (watts). Apparent power (VA) includes power factor considerations for AC systems.

Q2: How does this apply to three-phase systems?
A: For balanced three-phase systems, multiply by √3 (about 1.732) for line-to-line voltage.

Q3: What are typical voltage ranges for generators?
A: Common single-phase voltages are 120V or 240V; three-phase typically 208V, 240V, 480V, or higher.

Q4: Why is current measurement important?
A: Current determines conductor sizing and circuit protection requirements to prevent overheating.

Q5: How does generator power factor affect this calculation?
A: Many generators are rated at 0.8 power factor - the maximum kW output is typically 80% of the kVA rating.