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 energy conversion formula:

Where:

• \( W \) — Power consumption in watts
• \( h \) — Time duration in hours
• 1000 — Conversion factor from watts to kilowatts

Explanation: To convert watt-hours to kilowatt-hours, we divide by 1000 since 1 kilowatt equals 1000 watts.

3. Importance of Energy Conversion

Details: Understanding energy conversion helps in calculating electricity costs, comparing appliance efficiency, and managing energy consumption.

4. Using the Calculator

Tips: Enter power consumption in watts and time duration in hours. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between watts and watt-hours?
A: Watts measure power (rate of energy use), while watt-hours measure 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 calculate my electricity bill from kWh?
A: Multiply kWh by your electricity rate (price per kWh) from your utility bill.

Q4: Is kWh the same as kW per hour?
A: No, kWh is kilowatt-hours (energy), while kW/h would be kilowatts per hour (rate of change of power).

Q5: What's a typical kWh consumption for household appliances?
A: It varies widely - a 60W bulb running 10 hours uses 0.6 kWh, while a 1500W space heater running 1 hour uses 1.5 kWh.