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 energy consumed or produced per unit time and is measured in watts (W).

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

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

Explanation: This fundamental equation shows that electrical power equals the product of voltage and current in a circuit.

3. Importance of Power Calculation

Details: Calculating electrical power is essential for designing electrical systems, determining energy consumption, selecting appropriate components, and ensuring electrical safety in various applications.

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 applies. For AC circuits, power factor must be considered: P = V × I × PF.

Q2: How is electrical power related to energy consumption?
A: Energy consumption = Power × Time. For example, a 100W device running for 10 hours consumes 1 kWh of energy.

Q3: What are typical power ratings for household appliances?
A: LED bulbs: 5-20W, Laptop: 50-100W, Refrigerator: 100-400W, Microwave: 600-1200W, Electric heater: 1000-2000W.

Q4: How does power calculation help in circuit design?
A: It helps determine appropriate wire sizes, select circuit breakers, and ensure components can handle the electrical load without overheating.

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