1. What is Power and Energy?

Power is the rate at which work is done or energy is transferred, measured in watts (W). Energy is the capacity to do work, measured in watt-hours (Wh). The relationship between power and energy is fundamental in electrical systems and energy consumption calculations.

2. How Does the Calculator Work?

The calculator uses the energy formula:

Where:

• \( Power \) — Electrical power in watts (W)
• \( Time \) — Duration in hours (hr)
• \( Energy \) — Energy consumption in watt-hours (Wh)

Explanation: This formula calculates the total energy consumed by an electrical device based on its power rating and operating time.

3. Importance of Energy Calculation

Details: Calculating energy consumption is essential for electricity billing, energy efficiency analysis, battery capacity planning, and environmental impact assessment of electrical devices.

4. Using the Calculator

Tips: Enter power in watts and time in hours. Both values must be positive numbers. The result will be displayed in watt-hours (Wh).

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 (total consumption over time).

Q2: How do I convert watt-hours to kilowatt-hours?
A: Divide watt-hours by 1000 to get kilowatt-hours (kWh). For example, 1000 Wh = 1 kWh.

Q3: Can I use this for DC and AC circuits?
A: Yes, this formula applies to both DC and AC circuits when using true power measurements.

Q4: What is a typical power consumption for household appliances?
A: LED bulb: 5-15W, Laptop: 30-90W, Refrigerator: 100-800W, Microwave: 600-1200W.

Q5: How accurate is this calculation for real-world applications?
A: This provides theoretical calculation. Actual consumption may vary due to power factor, efficiency losses, and variable power usage.