1. What is a Power and Energy Calculator?

Definition: This calculator computes the energy consumed or produced based on power and time using the fundamental physics formula.

Purpose: It helps engineers, students, and professionals determine energy requirements or outputs for electrical systems and devices.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Energy (Joules)
• \( P \) — Power (Watts)
• \( t \) — Time (Seconds)

Explanation: Energy equals power multiplied by time, showing how much work is done or energy is consumed over a period.

3. Importance of Power and Energy Calculation

Details: Proper energy calculation ensures correct system design, energy efficiency, and cost estimation for electrical projects.

4. Using the Calculator

Tips: Enter the power in Watts and time in Seconds. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What if my time is in hours?
A: Convert hours to seconds (1 hour = 3600 seconds) before entering the value.

Q2: Can I calculate power if I know energy and time?
A: Yes, rearrange the formula: \( P = E / t \)

Q3: What are common power ratings for household devices?
A: Light bulbs: 40-100W, Laptop: 50W, Microwave: 1000W, etc.

Q4: How do I convert Joules to kWh?
A: Divide Joules by 3,600,000 (1 kWh = 3.6 million Joules).

Q5: Why is energy measured in Joules?
A: Joule is the SI unit of energy, representing the work done by 1 Newton over 1 meter.