1. What is an Electricity Usage Calculator?

Definition: This calculator estimates electricity consumption in kilowatt-hours (kWh) based on power consumption and usage time.

Purpose: It helps homeowners, businesses, and energy-conscious individuals understand and monitor their electricity usage.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula converts watt-hours to kilowatt-hours by dividing by 1000 (since 1 kWh = 1000 watt-hours).

3. Importance of Electricity Calculation

Details: Understanding electricity usage helps with energy conservation, cost estimation, and environmental impact assessment.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Where can I find a device's power consumption?
A: Check the device's label, manual, or specifications. Many devices list their power in watts.

Q2: How do I calculate monthly usage?
A: Multiply daily kWh by number of days, or calculate for each device and sum them up.

Q3: What's the average power consumption for common devices?
A: LED bulb: 10W, Laptop: 50W, Refrigerator: 100-400W, AC: 1000-5000W.

Q4: How does this relate to my electricity bill?
A: Multiply kWh by your electricity rate (per kWh) to estimate cost.

Q5: Why divide by 1000?
A: Electricity is billed in kilowatt-hours (kWh), and 1 kWh = 1000 watt-hours.