1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It represents the amount of work done by an electrical system per unit time and is measured in watts (W).

2. How Does the Calculator Work?

The calculator uses the fundamental power formula:

Where:

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

Explanation: This formula calculates the power consumed or produced in an electrical circuit by multiplying the voltage across the circuit by the current flowing through it.

3. Importance of 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 amperes. 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 for reactive loads, power factor must be considered.

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

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: 1000-2000W.

Q4: Can this formula be used for three-phase systems?
A: For balanced three-phase systems, power = √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 fuses/circuit breakers, and follow electrical safety protocols to prevent overheating and fire hazards.