1. What is an Electricity Usage Calculator?

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

Purpose: It helps users understand and monitor their electricity consumption for specific devices or appliances.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Electricity usage (kWh)
• \( P \) — Device power (watts)
• \( t \) — Usage time (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 Usage Calculation

Details: Understanding electricity usage helps with energy conservation, cost estimation, and identifying high-consumption devices.

4. Using the Calculator

Tips: Enter the device power in watts (check device label) 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 specifications. Some devices list power in amps - multiply by voltage (usually 120V) to get watts.

Q2: How can I estimate monthly usage?
A: Calculate daily usage then multiply by 30, or track actual usage patterns over time.

Q3: What's the cost of this electricity?
A: Multiply kWh result by your electricity rate (check your utility bill, typically $0.10-$0.30 per kWh).

Q4: Does this work for all electrical devices?
A: Yes, but for devices with variable power (like refrigerators), use average power or a power meter for accuracy.

Q5: Why divide by 1000?
A: This converts watt-hours to kilowatt-hours (kWh), the standard unit for electricity billing.