1. What is Electrical Energy?

Electrical energy is the energy derived from electric potential energy or kinetic energy of charged particles. It represents the amount of work that can be done by an electric current and is measured in joules (J) in the International System of Units.

2. How Does the Calculator Work?

The calculator uses the electrical energy formula:

Where:

• \( E \) — Electrical energy (joules)
• \( P \) — Power (watts)
• \( t \) — Time (seconds)

Explanation: This formula calculates the total electrical energy consumed or produced by multiplying the power rating by the time duration of operation.

3. Importance of Electrical Energy Calculation

Details: Calculating electrical energy is essential for determining energy consumption, calculating electricity costs, designing electrical systems, and understanding energy efficiency in various applications from household appliances to industrial machinery.

4. Using the Calculator

Tips: Enter power in watts and time in seconds. Both values must be positive numbers. The result will be displayed in joules, which is the standard unit of energy in the SI system.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between power and energy?
A: Power is the rate at which energy is transferred or converted (watts), while energy is the total amount of work done (joules). Power is energy per unit time.

Q2: How do I convert joules to kilowatt-hours?
A: 1 kilowatt-hour = 3,600,000 joules. Divide joules by 3,600,000 to get kWh.

Q3: Can this formula be used for AC and DC circuits?
A: Yes, for DC circuits directly. For AC circuits with resistive loads, use RMS values for accurate calculations.

Q4: What are typical power values for common appliances?
A: LED bulb: 5-15W, Laptop: 30-90W, Refrigerator: 100-800W, Microwave: 600-1200W, Electric heater: 1000-2000W.

Q5: Why is time measured in seconds for this calculation?
A: Because the watt is defined as one joule per second, so using seconds maintains consistency with SI units.