1. What is the Power Equation?

The power equation (P = V × I) is a fundamental formula in electrical engineering that calculates power in watts from voltage and current. It's part of Ohm's Law and is essential for circuit design and analysis.

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 in an electrical circuit.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical systems, selecting appropriate components, and ensuring safety in electrical installations.

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 AC and DC power calculations?
A: For DC circuits, P = V×I directly. For AC circuits, you need to consider power factor (P = V×I×PF).

Q2: How does power relate to energy?
A: Power is the rate of energy transfer. Energy (in watt-hours) = Power × Time.

Q3: What are typical household appliance power ratings?
A: LED bulb: 5-15W, Laptop: 50-100W, Microwave: 600-1200W, Refrigerator: 100-400W.

Q4: How do I calculate power in three-phase systems?
A: For balanced three-phase: P = √3 × V × I × PF (where V is line voltage).

Q5: Why is power calculation important for electrical safety?
A: It helps determine proper wire sizing, circuit breaker ratings, and prevents overheating in electrical systems.