1. What is the Wattage Formula?

The wattage formula (P = V × I × PF) calculates electrical power in watts (W) from voltage (V), current (I), and power factor (PF). It's fundamental for understanding electrical power consumption and circuit design.

2. How Does the Calculator Work?

The calculator uses the wattage formula:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)
• \( PF \) — Power factor (unitless, 0 to 1)

Explanation: The formula calculates real power in AC circuits. For DC circuits or purely resistive AC loads, the power factor is 1.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for electrical system design, energy consumption estimation, circuit protection, and equipment sizing.

4. Using the Calculator

Tips: Enter voltage in volts, current in amperes, and power factor (0 to 1). For DC circuits or purely resistive loads, use power factor = 1.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is converted to useful work (typically 0.8-1.0).

Q2: Why is power factor important?
A: Low power factor means more current is required for the same real power, increasing energy losses and requiring larger conductors.

Q3: What's the difference between real, apparent, and reactive power?
A: Real power (W) does work, apparent power (VA) is V×I, and reactive power (VAR) is stored in magnetic/ electric fields.

Q4: How can I improve power factor?
A: Use power factor correction capacitors, minimize idling motors, and use energy-efficient equipment.

Q5: Does this formula work for three-phase systems?
A: For three-phase, multiply by √3 (P = √3 × V × I × PF) for line-to-line voltage.