1. What is the Power Equation?

The basic electrical power equation (P = V × I) calculates power in watts from voltage and current. This fundamental relationship is essential for sizing generators, circuit breakers, 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 that power is directly proportional to both voltage and current. Doubling either voltage or current will double the power output.

3. Importance of Power Calculation

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

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers. The calculator will compute the power in watts.

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 reactive power and is only equal to real power in purely resistive loads.

Q2: How do I calculate three-phase power?
A: For balanced three-phase systems: P = √3 × V × I × PF, where PF is power factor (typically 0.8-1.0).

Q3: Why is generator power rating important?
A: The power rating determines how much electrical load the generator can safely handle without overheating or failing.

Q4: What happens if I exceed the generator's wattage rating?
A: Overloading can cause overheating, voltage drops, and potentially damage the generator or connected equipment.

Q5: How do I account for startup surges?
A: Some devices (like motors) require 3-7 times their running current at startup. Always check equipment specifications.