1. What is the Wattage Formula?

The wattage formula (P = V × I × PF) calculates the real power consumption of an electrical appliance by multiplying voltage (V), current (I), and power factor (PF). This gives the actual power being used by the device in watts.

2. How Does the Calculator Work?

The calculator uses the basic power formula:

Where:

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

Explanation: For purely resistive loads (like incandescent bulbs), PF is 1. For inductive loads (like motors), PF is typically between 0 and 1.

3. Importance of Wattage Calculation

Details: Calculating wattage helps determine energy consumption, size electrical systems appropriately, estimate operating costs, and ensure circuit safety.

4. Using the Calculator

Tips: Enter voltage in volts, current in amperes, and power factor (1 for resistive loads, typically 0.8-0.95 for motors). All values must be valid (voltage > 0, current > 0, 0 ≤ PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What if I don't know the power factor?
A: For resistive loads (heaters, incandescent lights), use 1. For motors, 0.8 is a common estimate unless specified otherwise.

Q2: How does this differ from VA (volt-amps)?
A: VA (V × I) is apparent power, while watts (V × I × PF) is real power. Only watts represent actual power consumption.

Q3: Why is power factor important?
A: Low PF means higher current is needed for the same real power, increasing energy losses in wiring and requiring larger conductors.

Q4: Can I use this for DC circuits?
A: Yes, for DC the formula simplifies to P = V × I since power factor is always 1 in DC circuits.

Q5: How accurate is this calculation?
A: It's mathematically exact, but accuracy depends on precise measurement of voltage, current, and power factor.