1. What is Joule's Law?

Joule's Law describes the relationship between power, time, and energy in electrical systems. It states that the energy (E) in joules is equal to the power (P) in watts multiplied by the time (t) in seconds.

2. How Does the Calculator Work?

The calculator uses Joule's Law formula:

Where:

• \( E \) — Energy in joules (J)
• \( P \) — Power in watts (W)
• \( t \) — Time in seconds (s)

Explanation: This fundamental equation calculates the amount of energy consumed or produced by an electrical device over a specific time period.

3. Importance of Energy Calculation

Details: Calculating energy consumption is essential for electrical engineering, energy management, cost estimation, and understanding power usage efficiency in various electrical systems and 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 of work done or heat generated (joules).

Q2: How do I convert joules to other energy units?
A: 1 joule = 0.239 calories, 1 kilowatt-hour = 3,600,000 joules, 1 BTU = 1055 joules.

Q3: Can this formula be used for AC circuits?
A: For AC circuits with resistive loads, yes. For reactive loads, power factor must be considered in the power calculation.

Q4: What are typical power values for household appliances?
A: LED bulb: 5-15W, Laptop: 30-90W, Refrigerator: 100-400W, Microwave: 600-1200W.

Q5: How accurate is this calculation for real-world applications?
A: The calculation provides theoretical values. Actual energy consumption may vary due to efficiency losses, voltage fluctuations, and other real-world factors.