1. What is Watt-Hours?

Watt-hours (Wh) is a unit of energy that represents the amount of power (in watts) consumed or produced over a period of time (in hours). It's commonly used to measure electrical energy consumption in homes and businesses.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Wh \) — Energy in watt-hours
• \( P \) — Power in watts (W)
• \( h \) — Time in hours

Explanation: This formula calculates the total energy consumption by multiplying the power consumption rate by the duration of use.

3. Importance of Watt-Hours Calculation

Details: Calculating watt-hours helps in understanding energy consumption, estimating electricity costs, sizing battery systems, and comparing energy efficiency of different devices.

4. Using the Calculator

Tips: Enter power in watts and time in hours. Both values must be positive numbers. For devices that list current (amps) instead of watts, first calculate watts using \( P = V \times I \) (voltage × current).

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 (total consumption over time).

Q2: How do I convert watt-hours to kilowatt-hours?
A: Divide watt-hours by 1000. For example, 1000 Wh = 1 kWh.

Q3: Can I use this for battery capacity calculations?
A: Yes, battery capacity is often rated in watt-hours, showing how much energy it can store.

Q4: How accurate are these calculations?
A: They're accurate for constant power draw. For devices with variable power, use average power over time.

Q5: What's a typical watt-hour consumption for household appliances?
A: A 60W bulb running for 5 hours uses 300 Wh. A fridge might use 1,500 Wh per day.