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Energy Formula:
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Energy is the capacity to do work or produce heat. The joule (J) is the SI unit of energy, named after physicist James Prescott Joule. It represents the amount of work done when a force of one newton moves an object one meter.
The calculator uses the fundamental energy formula:
Where:
Explanation: This formula calculates the total energy consumed or produced when a certain power is maintained over a specific time period. One watt equals one joule per second.
Details: Calculating energy in joules is essential for understanding energy consumption, electrical billing, mechanical work calculations, and thermal energy transfer in various scientific and engineering applications.
Tips: Enter power in watts and time in seconds. Both values must be positive numbers. The calculator will compute the energy in joules using the formula E = P × t.
Q1: What is the relationship between watts and joules?
A: One watt equals one joule per second. Power measures the rate of energy transfer, while energy measures the total amount transferred.
Q2: Can this calculator be used for electrical energy calculations?
A: Yes, this formula is commonly used to calculate electrical energy consumption when you know the power rating of an appliance and the time it operates.
Q3: How do I convert joules to other energy units?
A: Common conversions include: 1 calorie = 4.184 joules, 1 kilowatt-hour = 3,600,000 joules, 1 BTU = 1,055 joules.
Q4: What are typical energy values in joules?
A: A 100W light bulb uses 100 joules per second, a smartphone battery stores about 10,000-20,000 joules, and an adult's daily energy intake is approximately 8,000,000 joules.
Q5: Is this formula applicable to all types of energy?
A: This specific formula (E = P × t) is primarily used for calculating energy from power over time, particularly in electrical and mechanical contexts. Other energy forms may require different formulas.