1. What is a Watt-Hours Calculator?

Definition: This calculator computes energy consumption in watt-hours based on power usage in watts and operating time in hours.

Purpose: It helps determine electrical energy usage for appliances, devices, and electrical systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: Multiplying power consumption by operating time gives total energy consumed.

3. Importance of Watt-Hours Calculation

Details: Calculating watt-hours helps estimate electricity costs, size battery systems, and understand energy efficiency.

4. Using the Calculator

Tips: Enter the device's power consumption in watts and the duration of use in hours. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I convert watt-hours to kilowatt-hours?
A: Divide watt-hours by 1000 (1 kWh = 1000 Wh).

Q2: Where can I find an appliance's wattage?
A: Check the label, manual, or manufacturer specifications. Some devices show it on their power supply.

Q3: Can I use this for DC and AC systems?
A: Yes, as long as you use the correct wattage (for AC, use real power not apparent power).

Q4: What's the difference between watts and watt-hours?
A: Watts measure power (rate of energy use), watt-hours measure energy (power × time).

Q5: How accurate is this calculation?
A: It's precise for constant loads. For variable loads, use average wattage over the time period.