1. What is Kilowatt-hour (kWh)?

A kilowatt-hour (kWh) is a unit of energy equal to one kilowatt (1 kW) of power expended for one hour (1 h) of time. It's the standard unit used by electric utilities to measure energy consumption.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( W \) — Power in watts
• \( h \) — Time in hours
• 1000 — Conversion factor (1000 watts = 1 kilowatt)

Explanation: The formula converts watt-hours to kilowatt-hours by dividing by 1000, since 1 kilowatt equals 1000 watts.

3. Importance of Energy Calculation

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

4. Using the Calculator

Tips: Enter power in watts and time in hours. All values must be positive numbers. The result shows energy consumption in kilowatt-hours.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kW and kWh?
A: kW (kilowatt) measures power (rate of energy use), while kWh (kilowatt-hour) measures energy (power × time).

Q2: How many kWh is 1000 watts for 1 hour?
A: Exactly 1 kWh (1000 watts × 1 hour ÷ 1000 = 1 kWh).

Q3: How do I estimate my electricity bill from kWh?
A: Multiply kWh by your electricity rate (e.g., 10 kWh × $0.15/kWh = $1.50).

Q4: Why divide by 1000 in the formula?
A: To convert from watts (W) to kilowatts (kW), since 1 kW = 1000 W.

Q5: Can I use this for DC circuits?
A: Yes, the calculation works the same for both AC and DC power.