1. What is an Energy Usage Calculator?

Definition: This calculator estimates the energy consumption in kilowatt-hours based on power consumption and usage time.

Purpose: It helps homeowners, businesses, and energy professionals calculate electricity usage for better energy management and cost estimation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Energy usage (kilowatt-hours)
• \( P \) — Power consumption (watts)
• \( t \) — Usage time (hours)

Explanation: The power consumption multiplied by usage time gives watt-hours, which is then converted to kilowatt-hours by dividing by 1000.

3. Importance of Energy Usage Calculation

Details: Understanding energy consumption helps in budgeting electricity costs, identifying energy-saving opportunities, and reducing environmental impact.

4. Using the Calculator

Tips: Enter the power consumption in watts and usage time in hours. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find the power consumption of my device?
A: Check the device's label, manual, or specifications. Many devices list their power consumption in watts.

Q2: Can I use this for multiple devices?
A: Yes, either calculate each device separately and sum the results, or enter the total power and average usage time.

Q3: How accurate is this calculation?
A: It provides a good estimate for constant power devices. For devices with variable power, it gives an average.

Q4: How can I convert kWh to cost?
A: Multiply the kWh result by your electricity rate (cost per kWh from your utility bill).

Q5: What's a typical power consumption for household items?
A: LED bulb: 10W, Laptop: 50W, Refrigerator: 100-400W, AC unit: 1000-5000W.