1. What is Watt Hour?

A 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 equation:

Where:

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

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

3. Importance of Watt Hour Calculation

Details: Calculating watt-hours helps in understanding energy consumption, estimating electricity costs, and sizing battery systems for various applications.

4. Using the Calculator

Tips: Enter power in watts and time in hours. Both values must be positive numbers.

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 DC and AC circuits?
A: Yes, as long as you know the true power in watts (for AC, this means using real power, not apparent power).

Q4: How accurate is this calculation?
A: It's perfectly accurate for constant power draw. For variable power, you'd need to calculate for each time segment.

Q5: What's a typical watt-hour consumption for household appliances?
A: A 60W bulb running for 5 hours uses 300Wh (0.3kWh). A refrigerator might use 1-2kWh per day.