1. What is the Electrical Energy Formula?

The electrical energy formula E = P × t calculates the amount of energy consumed or produced by an electrical device, where E is energy in joules, P is power in watts, and t is time in seconds.

2. How Does the Calculator Work?

The calculator uses the electrical energy formula:

Where:

• \( E \) — Electrical energy (J)
• \( P \) — Power (W)
• \( t \) — Time (s)

Explanation: This formula calculates the total energy consumed by multiplying the power rating of a device by the time it operates.

3. Importance of Electrical Energy Calculation

Details: Calculating electrical energy is essential for determining energy consumption, estimating electricity costs, designing electrical systems, and understanding energy efficiency of devices.

4. Using the Calculator

Tips: Enter power in watts, time in seconds. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between power and energy?
A: Power is the rate at which energy is consumed or produced (watts), while energy is the total amount consumed over time (joules).

Q2: How can I convert joules to kilowatt-hours?
A: To convert joules to kilowatt-hours, divide the energy in joules by 3,600,000 (since 1 kWh = 3,600,000 J).

Q3: Why is time measured in seconds?
A: The SI unit for energy is joules, which is defined as watts × seconds. Using seconds ensures consistency with SI units.

Q4: Can this formula be used for AC circuits?
A: For AC circuits with resistive loads, this formula works with RMS values. For reactive loads, additional factors like power factor must be considered.

Q5: What are typical power values for household appliances?
A: LED bulbs: 5-15W, Laptop: 50-100W, Refrigerator: 100-400W, Microwave: 600-1200W, Air conditioner: 1000-5000W.