1. What is Watt-Hour Calculation?

The watt-hour (Wh) calculation measures energy consumption by multiplying power in watts by time in hours. It's particularly useful for estimating laptop battery usage and comparing energy efficiency between devices.

2. How Does the Calculator Work?

The calculator uses the basic power formula:

Where:

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

Explanation: This simple formula converts power usage over time into total energy consumed, which is how battery capacities are typically measured.

3. Importance of Power Consumption Calculation

Details: Calculating watt-hours helps estimate battery life, compare device efficiency, and understand energy costs. It's essential for choosing the right power supply or battery capacity.

4. Using the Calculator

Tips: Enter the laptop's power consumption in watts (typically 15-65W for most laptops) and your expected usage time in hours. The calculator will show total energy consumption in watt-hours.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my laptop's power consumption?
A: Check the power adapter rating (usually 15W-65W for ultrabooks, up to 200W+ for gaming laptops), or use a power meter for precise measurement.

Q2: How does this relate to battery capacity?
A: If your battery is rated at 60Wh and your laptop uses 20W, you can expect about 3 hours of use (60Wh ÷ 20W = 3h).

Q3: Does screen brightness affect power consumption?
A: Yes, higher brightness increases power draw. Power-saving modes can reduce consumption by 20-40%.

Q4: What's the difference between Wh and mAh?
A: mAh (milliamp-hours) measures charge, while Wh measures energy. To convert, you need the battery voltage (Wh = V × mAh ÷ 1000).

Q5: How accurate is this calculation?
A: It provides a theoretical maximum. Real-world usage varies with workload, temperature, and battery age.