1. What is the Power Equation?

The power equation (P = V × I) relates electrical power (P in watts), voltage (V in volts), and current (I in amperes). It's a fundamental equation in electrical engineering and physics.

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 calculator solves for the missing variable when any two of the three values are provided.

3. Practical Applications

Details: This calculation is essential for designing electrical circuits, sizing wires and fuses, determining power consumption, and selecting appropriate power supplies.

4. Using the Calculator

Tips: Enter any two known values (power, voltage, or current) and leave the field you want to calculate empty. The calculator will solve for the missing value.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between AC and DC in these calculations?
A: The basic P=VI formula works for DC. For AC, you need to consider power factor (P = V × I × PF) for accurate calculations.

Q2: How do I calculate power for three-phase systems?
A: For balanced three-phase systems, use P = √3 × V × I × PF where V is line-to-line voltage.

Q3: What if I know resistance instead of current?
A: You can use P = V²/R or P = I²R if you know resistance (R) instead of current or voltage.

Q4: Why does my actual power consumption differ from calculations?
A: Real-world factors like efficiency, power factor, and voltage fluctuations can cause differences.

Q5: How accurate are these calculations?
A: The calculations are theoretically precise, but actual measurements may vary due to instrument accuracy and environmental factors.