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:

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

Explanation: The formula multiplies power consumption by time to calculate total energy used.

3. Importance of Watt-Hour Calculation

Details: Calculating watt-hours helps estimate energy consumption of electrical devices, calculate electricity costs, and design solar power systems or battery banks.

4. Using the Calculator

Tips: Enter power in watts and time in hours. Both values must be positive numbers. For devices rated in kilowatts, multiply by 1000 to convert to watts.

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 do I convert watt-hours to kilowatt-hours?
A: Divide watt-hours by 1000 (1 kWh = 1000 Wh).

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

Q4: How accurate is this calculation?
A: It's accurate for constant power draw. For variable power, you'd need to calculate for each power level and sum the results.

Q5: What's a typical watt-hour consumption for household appliances?
A: A 60W bulb running for 5 hours = 300 Wh. A 1500W heater for 2 hours = 3000 Wh (3 kWh).