1. What is the Electrical Power Formula?

The electrical power formula (P = V × I) calculates the power consumed or produced in an electrical circuit. It represents the rate at which electrical energy is transferred by an electric circuit, measured in watts.

2. How Does the Calculator Work?

The calculator uses the electrical power formula:

Where:

• \( P \) — Electrical power (watts)
• \( V \) — Voltage (volts)
• \( I \) — Current (amps)

Explanation: This fundamental formula in electrical engineering shows that power is directly proportional to both voltage and current in a circuit.

3. Importance of Electrical Power Calculation

Details: Calculating electrical power is essential for circuit design, energy consumption analysis, electrical safety assessments, and determining the capacity requirements for electrical components and systems.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. 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 = V × I directly. For AC circuits with resistive loads, it's the same, but with reactive loads, power factor must be considered.

Q2: How is electrical power related to energy?
A: Power is the rate of energy consumption. Energy (in watt-hours) = Power (watts) × Time (hours).

Q3: What are typical power ratings for household appliances?
A: LED bulbs: 5-20W, Laptop: 50-100W, Microwave: 800-1500W, Electric heater: 1500-3000W.

Q4: Can this formula be used for three-phase systems?
A: For balanced three-phase systems, use P = √3 × V × I × power factor, where V is line voltage and I is line current.

Q5: What safety considerations are important when working with electrical power?
A: Always ensure circuits are properly rated for calculated power, use appropriate circuit protection, and follow electrical safety standards to prevent overheating and fire hazards.