1. What is the Kilowatt Hour Formula?

The kilowatt hour (kWh) is a unit of energy that represents power consumption over time. It's commonly used by electric utilities for billing purposes and is calculated by multiplying power in watts by time in hours and dividing by 1000.

2. How Does the Calculator Work?

The calculator uses the kilowatt hour formula:

Where:

• \( Power \) — Electrical power in watts (W)
• \( Time \) — Duration in hours
• 1000 — Conversion factor from watts to kilowatts

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: Calculating energy consumption helps in understanding electricity usage, estimating costs, and improving energy efficiency in homes and businesses.

4. Using the Calculator

Tips: Enter power in watts and time in hours. Both values must be positive numbers. The result will be displayed in kilowatt-hours (kWh).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between watts and kilowatt-hours?
A: Watts measure power (rate of energy use), while kilowatt-hours measure energy (power × time).

Q2: How can I estimate my electricity bill using kWh?
A: Multiply your kWh usage by your electricity rate (price per kWh) to estimate costs.

Q3: What's a typical kWh usage for household appliances?
A: It varies widely - a 60W bulb running for 10 hours uses 0.6 kWh, while a 1500W space heater uses 1.5 kWh per hour.

Q4: Why divide by 1000 in the formula?
A: To convert from watt-hours (Wh) to kilowatt-hours (kWh), since 1 kW = 1000 W.

Q5: Can I use this for DC circuits as well as AC?
A: Yes, the formula works for both DC and AC circuits when using real power (not apparent power).