1. What is the Power Calculation Formula?

The power calculation formula P = I × V is a fundamental equation in electrical engineering that calculates electrical power from current and voltage. It represents the rate at which electrical energy is transferred by an electric circuit.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

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

Explanation: This formula shows that electrical power is directly proportional to both current and voltage. When either current or voltage increases, the power output increases proportionally.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for circuit design, electrical safety, energy consumption analysis, and proper sizing of electrical components and systems.

4. Using the Calculator

Tips: Enter current in amperes (A) and voltage in volts (V). Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between AC and DC power calculation?
A: For DC circuits, P = I × V directly. For AC circuits, power factor must be considered: P = I × V × PF.

Q2: How does this relate to energy consumption?
A: Energy consumption = Power × Time. For example, 100W used for 10 hours = 1 kWh (kilowatt-hour).

Q3: What are typical power values for household appliances?
A: LED bulb: 5-15W, Laptop: 50-100W, Microwave: 800-1500W, Air conditioner: 1000-5000W.

Q4: Can this formula be used for three-phase systems?
A: For three-phase systems, use P = √3 × I × V × PF for balanced loads.

Q5: What safety considerations are important?
A: Always ensure circuits are properly rated for calculated power, use appropriate fuses/circuit breakers, and follow electrical safety standards.