1. What is the Power Calculation?

The power calculation (P = V × I) determines the electrical power in watts when you know the voltage and current. It's a fundamental equation in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

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

Explanation: This simple multiplication gives the rate of energy conversion or transfer in an electrical circuit.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical systems, selecting appropriate wiring and components, and determining energy consumption.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between watts and volt-amps?
A: Watts represent real power, while volt-amps (VA) represent apparent power. They're equal in DC circuits or AC circuits with purely resistive loads.

Q2: How does this relate to household appliances?
A: Knowing the power helps estimate energy consumption (watt-hours) and electrical costs when multiplied by usage time and electricity rate.

Q3: What's a typical power consumption for household devices?
A: LED bulbs: 5-15W, Laptop: 50-100W, Refrigerator: 100-400W, Microwave: 600-1200W, depending on models and usage.

Q4: Can I use this for three-phase power calculations?
A: For balanced three-phase systems, you'd multiply by √3 (about 1.732) to account for phase relationships: P = √3 × V × I × PF.

Q5: Why is 220V common in many countries?
A: Higher voltages allow more power transmission with less current, reducing energy loss in wires and enabling thinner, less expensive wiring.