1. What is the Watt Usage Formula?

The watt usage formula calculates energy consumption in kilowatt-hours (kWh) from an appliance's power rating and usage time. It helps estimate electricity costs and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the watt usage formula:

Where:

• \( kWh \) — Kilowatt-hours (energy consumption)
• \( P \) — Power consumption in watts (W)
• \( h \) — Usage time in hours

Explanation: The formula converts watt-hours to kilowatt-hours by dividing by 1000, since 1 kilowatt = 1000 watts.

3. Importance of Energy Calculation

Details: Calculating energy consumption helps in understanding electricity costs, comparing appliance efficiency, and managing energy usage for sustainability.

4. Using the Calculator

Tips: Enter the appliance's power rating (usually found on its label) in watts and the duration of use in hours. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my appliance's wattage?
A: Check the appliance's label, manual, or specifications online. If only amps and volts are listed, multiply them (P = V × I).

Q2: What's the cost of this energy usage?
A: Multiply kWh by your electricity rate (check your bill). Example: 2 kWh × $0.12/kWh = $0.24.

Q3: Does standby power consumption count?
A: Yes, if the appliance is plugged in but not in active use, it may still draw "phantom load" (typically 1-5W).

Q4: How accurate is this calculation?
A: It's accurate for constant power devices. For variable power devices (like refrigerators), use an energy monitor for precise measurement.

Q5: Can I calculate monthly usage?
A: Yes, multiply daily kWh by number of days used per month. For example: (0.5 kWh/day) × 30 days = 15 kWh/month.