1. What is Power in Electrical Systems?

Power in electrical systems represents the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W) and indicates how much work can be done by an electrical device in a given time period.

2. How Does the Calculator Work?

The calculator uses the fundamental power formula:

Where:

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

Explanation: This formula expresses the relationship between voltage (electrical pressure), current (flow of electrons), and the resulting power output.

3. Importance of Power Calculation

Details: Calculating electrical power is essential for designing electrical circuits, selecting appropriate components, determining energy consumption, and ensuring electrical safety in residential, commercial, and industrial applications.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

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

Q2: How does power relate to energy consumption?
A: Energy (kWh) = Power (kW) × Time (hours). Power indicates instantaneous rate, while energy represents total consumption over time.

Q3: What are typical power ratings for household appliances?
A: LED bulb: 5-15W, Laptop: 50-100W, Refrigerator: 100-400W, Microwave: 800-1500W, Electric heater: 1500-3000W.

Q4: Why is power calculation important for circuit design?
A: It helps determine wire sizes, circuit breaker ratings, and ensures components can handle the electrical load safely.

Q5: Can this formula be used for three-phase systems?
A: For three-phase systems, the formula is P = √3 × V × I × PF, where V is line voltage and I is line current.