1. What is kWh and Watts?

Definition: This calculator converts power consumption in watts to energy usage in kilowatt-hours (kWh) based on usage time.

Purpose: It helps estimate electricity consumption and costs for appliances and devices.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E_{kWh} \) — Energy consumption (kilowatt-hours)
• \( P_w \) — Power consumption (watts)
• \( t \) — Time of usage (hours)

Explanation: The power in watts is multiplied by time in hours, then divided by 1000 to convert to kilowatt-hours.

3. Importance of Energy Calculation

Details: Understanding energy consumption helps in estimating electricity costs, comparing appliance efficiency, and managing power usage.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How do I find my appliance's wattage?
A: Check the label on the appliance or its manual. Some devices list amps and volts instead (Watts = Amps × Volts).

Q2: What's the difference between watts and kilowatt-hours?
A: Watts measure power (rate of energy use), while kWh measures energy (total consumption over time).

Q3: How can I estimate my electricity bill with this?
A: Multiply the kWh result by your electricity rate (cost per kWh).

Q4: What's a typical wattage for household appliances?
A: LED bulb: 10W, Laptop: 50W, Refrigerator: 150W, Microwave: 1000W.

Q5: Can I use this for devices with variable power?
A: For best results, use average power consumption if the device cycles on/off.