1. What is Electricity Usage Calculator?

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

Purpose: It helps individuals understand their electricity consumption for specific devices or appliances.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Electricity usage (kilowatt-hours)
• \( P \) — Power of the device (watts)
• \( t \) — Time of usage (hours)

Explanation: The device power is multiplied by usage time to get watt-hours, then divided by 1000 to convert to kilowatt-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 power in watts and usage time in hours. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find my device's power rating?
A: Check the device label, manual, or manufacturer's specifications. Some devices list power in amps and volts (P = V × I).

Q2: How can I estimate monthly usage?
A: Multiply the daily kWh result by the number of days used per month.

Q3: What's the average power consumption for common devices?
A: LED bulb: 10W, Laptop: 50W, TV: 100W, Refrigerator: 150W, Microwave: 1000W.

Q4: How do I convert kWh to cost?
A: Multiply kWh by your electricity rate (check your utility bill for $/kWh rate).

Q5: Why divide by 1000?
A: 1 kilowatt = 1000 watts, so we divide by 1000 to convert watt-hours to kilowatt-hours.