1. What is kWh?

A kilowatt-hour (kWh) is a unit of energy representing the amount of energy consumed at a rate of 1 kilowatt (1000 watts) over one hour. It's the standard unit used by electric utilities for billing purposes.

2. How the Conversion Works

The conversion formula is simple:

Where:

• \( kWh \) — Kilowatt-hours (energy)
• \( W \) — Power in watts
• \( h \) — Time in hours

Explanation: This converts watt-hours to kilowatt-hours by dividing by 1000 (since 1 kilowatt = 1000 watts).

3. Practical Applications

Details: This calculation is essential for estimating electricity costs, sizing solar power systems, comparing appliance efficiency, and understanding energy consumption patterns.

4. Using the Calculator

Tips: Enter the power consumption in watts and the operating time in hours. For devices with variable power, use average wattage.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my appliance's wattage?
A: Check the label or manual. If only amps and volts are listed, multiply them (W = A × V).

Q2: What's the difference between kW and kWh?
A: kW measures power (rate of energy use), kWh measures energy (power × time).

Q3: How can I estimate my electricity bill?
A: Multiply kWh by your utility's rate (usually $0.10-$0.30 per kWh).

Q4: Is this calculation accurate for all devices?
A: It works best for constant-load devices. For cycling devices (like refrigerators), use energy monitoring tools.

Q5: Can I convert kWh back to watts?
A: Only if you know the time period: W = (kWh × 1000) ÷ h.