1. What is a W to kWh Calculator?

Definition: This calculator converts power consumption in watts to energy consumption in kilowatt-hours over a specified time period.

Purpose: It helps estimate electricity usage and costs for electrical 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 duration (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 power consumption in watts and the time duration in hours. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 1000?
A: We divide by 1000 to convert watt-hours to kilowatt-hours (1 kWh = 1000 Wh).

Q2: How do I find the wattage of my appliance?
A: Check the label on the appliance, manual, or manufacturer specifications. Some devices list amps and volts instead (W = A × V).

Q3: Can I use this for multiple devices?
A: Yes, calculate each device separately and sum the results for total consumption.

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

Q5: What's a typical kWh consumption for household items?
A: For example: LED bulb (10W) for 5h = 0.05 kWh, Laptop (50W) for 8h = 0.4 kWh, Refrigerator (200W) for 24h = 4.8 kWh.