1. What is 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:

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

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

3. Importance of Energy Calculation

Details: Understanding energy consumption helps in estimating electricity costs, sizing solar power systems, and evaluating energy efficiency of appliances.

4. Using the Calculator

Tips: Enter power consumption in watts and duration in hours. For example, a 100W bulb running for 10 hours consumes 1 kWh (100 × 10 ÷ 1000).

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 1 unit of electricity?
A: 1 unit on electricity bills typically equals 1 kWh.

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

Q4: What's a typical kWh consumption for household appliances?
A: Refrigerator: 1-2 kWh/day, LED bulb: 0.01 kWh/hour, AC: 1-3 kWh/hour.

Q5: How does this relate to solar panel systems?
A: Solar systems are often rated in kW, and their daily output in kWh helps determine how much energy they can provide.