1. What is a Kilowatt-hour (kWh)?

A kilowatt-hour (kWh) is a unit of energy representing the amount of electricity consumed by a 1,000-watt appliance running for one hour. It's the standard measurement used by utility companies for billing purposes.

2. How the Calculation Works

The calculator uses the basic energy formula:

Where:

• \( kWh \) — Kilowatt-hours (energy)
• \( P \) — Power in watts (W)
• \( h \) — Time in hours
• 1000 — Conversion factor (watts to kilowatts)

Explanation: This converts watt-hours to kilowatt-hours by dividing by 1,000, since 1 kilowatt = 1,000 watts.

3. Practical Applications

Details: Understanding kWh helps estimate electricity costs, compare appliance efficiency, and calculate energy savings from conservation measures.

4. Using the Calculator

Tips: Enter the appliance's power rating in watts and the number of hours it operates. For multiple appliances, calculate each separately and sum the results.

5. Frequently Asked Questions (FAQ)

Q1: How many kWh per day is normal?
A: Average U.S. household uses about 30 kWh/day, but this varies greatly by home size, appliances, and climate.

Q2: How do I find my appliance's wattage?
A: Check the nameplate or manual. Alternatively, use a watt meter for direct measurement.

Q3: What's the cost of 1 kWh?
A: U.S. average is about $0.15/kWh (2023), but check your utility bill for exact rates.

Q4: How accurate is this calculation?
A: It assumes constant power draw. Devices with variable speeds (like refrigerators) may need more complex calculations.

Q5: Can I convert kWh back to watts?
A: Yes, if you know the time: \( P = \frac{kWh \times 1000}{h} \)