1. What is Watt-hour Calculation?

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
• \( h \) — 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. Importance of Energy Calculation

Details: Calculating energy consumption helps in understanding electricity usage, estimating costs, and designing power systems with appropriate capacity.

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: How is this different from kWh?
A: 1 kilowatt-hour (kWh) equals 1000 watt-hours (Wh). kWh is the standard unit for electricity billing.

Q2: Can I use this for battery capacity?
A: Yes, battery capacity is often rated in watt-hours, showing how long it can power a device.

Q3: How accurate is this calculation?
A: It's accurate for constant power draw. For variable loads, you'd need to calculate energy for each power level and sum them.

Q4: What about power factor in AC circuits?
A: This simple formula works for DC or resistive AC loads. For reactive AC loads, apparent power (VA) would be more appropriate.

Q5: How can I estimate my electricity cost from this?
A: Multiply watt-hours by your electricity rate (per kWh). Divide Wh by 1000 to get kWh, then multiply by cost per kWh.