1. What is the Power Equation?

The power equation (W = V × I) calculates electrical power in watts from voltage and current. This fundamental electrical formula is used to determine the power consumption or generation in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

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

Explanation: The equation shows the direct proportional relationship between power, voltage, and current in electrical systems.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for electrical system design, energy consumption analysis, circuit protection sizing, and determining appropriate wire gauges for safe operation.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. All values must be valid positive numbers. The calculator will 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, power is simply V × I. For AC circuits, power factor must be considered (P = V × I × PF).

Q2: How is this different from apparent power?
A: This calculates real power (watts). Apparent power (VA) is V × I without considering power factor.

Q3: Can I use this for three-phase systems?
A: For three-phase systems, the formula is P = √3 × V × I × PF for balanced loads.

Q4: What are typical voltage and current ranges?
A: Residential: 120/240V, 15-200A; Industrial: 208-480V, higher currents; Electronics: 3.3-48V, lower currents.

Q5: How accurate is this calculation?
A: The calculation is mathematically precise. Accuracy depends on the precision of your voltage and current measurements.