The Energy Difference Calculator helps users determine the change in energy between two states in a system. Whether you’re analyzing mechanical motion, electrical energy shifts, or thermodynamic processes, this calculator provides an accurate way to measure the increase or decrease in energy over time or action.
This calculator belongs to the Physics and Thermodynamics Calculator category. It proves useful in labs, engineering design, HVAC diagnostics, and energy consumption analysis.
Formula of Energy Difference Calculator
Energy Difference Formula
ΔE = E₂ − E₁
Where:
- E₂ is the final energy (measured in joules, kilojoules, electronvolts, etc.)
- E₁ is the initial energy
- ΔE is the energy difference or change in energy
For Thermodynamic Systems
If the system follows thermodynamic behavior, use:
ΔE = Q − W
Where:
- Q is the heat added to the system
- W is the work done by the system
This variant works for closed systems where energy input and output involve heat and work.
Reference Table
| Initial Energy (E₁) | Final Energy (E₂) | Energy Difference (ΔE) |
|---|---|---|
| 1200 J | 1500 J | 300 J |
| 800 J | 500 J | -300 J |
| 3000 J | 3000 J | 0 J |
| 200 J | 220 J | 20 J |
| 1000 J | 1200 J | 200 J |
This table helps visualize typical energy changes in physical systems.
Example of Energy Difference Calculator
Suppose a system starts with 500 joules of energy and ends with 1200 joules.
ΔE = E₂ − E₁
ΔE = 1200 − 500 = 700 joules
The system gained 700 joules of energy.
For a thermodynamic case:
If 1000 J of heat enters a system and it performs 400 J of work,
ΔE = Q − W
ΔE = 1000 − 400 = 600 J
The system’s internal energy increased by 600 joules.
Most Common FAQs
It means the system lost energy between the two states.
No. You must use the same units for both energy values to get a valid result.
Use ΔE = Q − W when analyzing systems that involve both heat and work transfers, such as engines or compressors.