1. What is Watt Hour?

The watt-hour (Wh) is a unit of energy equivalent to one watt (1 W) of power expended for one hour (1 h) of time. It's commonly used to measure electrical energy consumption.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Wh \) — Watt-hours (energy)
• \( P \) — Power in watts (W)
• \( h \) — Time in hours

Explanation: This calculation shows how much energy is consumed when a device operates at a certain power level for a specific duration.

3. Practical Applications

Details: Watt-hours are used to estimate electricity costs, size battery systems, and compare energy efficiency of appliances.

4. Using the Calculator

Tips: Enter power consumption in watts and operating time in hours. For devices rated in kilowatts, multiply by 1000 to convert to watts.

5. Frequently Asked Questions (FAQ)

Q1: How is watt-hour different from watt?
A: Watts measure power (rate of energy use), while watt-hours measure energy (power × time).

Q2: How many watt-hours are in a kilowatt-hour?
A: 1 kilowatt-hour (kWh) = 1000 watt-hours (Wh).

Q3: Can I use this for battery capacity calculations?
A: Yes, battery capacities are often rated in watt-hours (or amp-hours at a specific voltage).

Q4: How accurate is this calculation for real devices?
A: It's accurate for constant power devices. For variable power devices, you'd need to integrate power over time.

Q5: Why is watt-hour important for solar systems?
A: It helps determine how much energy your system needs to produce/store to meet your consumption needs.