The conversion of 4.5 ev to joules results in approximately 7.20 × 10-19 joules.
Since 1 electron volt (ev) equals 1.602 × 10-19 joules, multiplying this value by 4.5 gives the energy in joules. This calculation helps to translate the energy from the ev unit into the SI unit, joules, which is used universally in physics and engineering.
Conversion Result
4.5 ev is equal to 7.20 × 10-19 joules.
Conversion Tool
Result in joules:
Conversion Formula
The conversion from electron volts to joules is based on the fundamental relationship: 1 ev equals 1.602 × 10-19 joules. This is because the charge of an electron is approximately 1.602 × 10-19 coulombs, and energy is charge times voltage. To convert, multiply the ev value by this constant. For example, for 4.5 ev: 4.5 × 1.602e-19 = 7.209e-19 joules.
Conversion Example
- Convert 2 ev:
- Multiply 2 by 1.602e-19.
- 2 × 1.602e-19 = 3.204e-19 joules.
- Convert 10 ev:
- Multiply 10 by 1.602e-19.
- 10 × 1.602e-19 = 1.602e-18 joules.
- Convert 0.5 ev:
- Multiply 0.5 by 1.602e-19.
- 0.5 × 1.602e-19 = 8.01e-20 joules.
- Convert 7 ev:
- Multiply 7 by 1.602e-19.
- 7 × 1.602e-19 = 1.1214e-18 joules.
- Convert 1.2 ev:
- Multiply 1.2 by 1.602e-19.
- 1.2 × 1.602e-19 = 1.9224e-19 joules.
Conversion Chart
| ev | Joules |
|---|---|
| -20.5 | -3.283e-18 |
| -19.5 | -3.125e-18 |
| -18.5 | -2.967e-18 |
| -17.5 | -2.808e-18 |
| -16.5 | -2.65e-18 |
| -15.5 | -2.492e-18 |
| -14.5 | -2.333e-18 |
| -13.5 | -2.175e-18 |
| -12.5 | -2.017e-18 |
| -11.5 | -1.858e-18 |
| -10.5 | -1.7e-18 |
| -9.5 | -1.542e-18 |
| -8.5 | -1.383e-18 |
| -7.5 | -1.225e-18 |
| -6.5 | -1.067e-18 |
| -5.5 | -9.095e-19 |
| -4.5 | -7.209e-19 |
| -3.5 | -5.323e-19 |
| -2.5 | -3.438e-19 |
| -1.5 | -1.552e-19 |
| -0.5 | -8.01e-20 |
| 0.5 | 8.01e-20 |
| 1.5 | 1.522e-19 |
| 2.5 | 4.005e-19 |
| 3.5 | 6.49e-19 |
| 4.5 | 7.209e-19 |
| 5.5 | 8.894e-19 |
| 6.5 | 1.053e-18 |
| 7.5 | 1.208e-18 |
| 8.5 | 1.366e-18 |
| 9.5 | 1.523e-18 |
| 10.5 | 1.681e-18 |
| 11.5 | 1.839e-18 |
| 12.5 | 1.996e-18 |
| 13.5 | 2.154e-18 |
| 14.5 | 2.312e-18 |
| 15.5 | 2.469e-18 |
| 16.5 | 2.627e-18 |
| 17.5 | 2.785e-18 |
| 18.5 | 2.943e-18 |
| 19.5 | 3.101e-18 |
| 20.5 | 3.258e-18 |
| 29.5 | 4.727e-18 |
Use this chart to quickly find the joule equivalent of any ev value between -20.5 and 29.5, by matching the ev value with the corresponding joules in the table.
Related Conversion Questions
- How many joules are in 4.5 ev?
- What is 4.5 ev in terms of joules?
- Can you convert 4.5 ev to joules accurately?
- What is the joule equivalent of 4.5 electron volts?
- How do I convert 4.5 ev into joules?
- What formula is used to change ev to joules for 4.5 ev?
- Is 4.5 ev equal to 7.2 × 10-19 joules?
Conversion Definitions
ev
Electron volt (ev) is a unit measuring energy, representing the energy gained or lost by an electron moving across an electric potential difference of one volt. It is used mainly in atomic and particle physics to describe small energy quantities.
Joules
Joules (J) is the SI unit of energy, defined as the work done when a force of one newton moves an object one meter. It is used universally to quantify energy, heat, and work in physics, engineering, and other sciences.
Conversion FAQs
How precise is the conversion from ev to joules?
The conversion uses a fixed constant, 1 ev = 1.602 × 10-19 joules, providing high accuracy for most scientific purposes. Minor discrepancies may occur due to rounding, but for typical calculations, it is sufficiently precise.
Why is the ev unit used instead of joules in atomic physics?
Electron volts are more convenient for small energy scales like atomic or subatomic particles because joules are too large for such tiny energies. Ev simplifies calculations and data representation in fields dealing with microscopic phenomena.
Can I convert negative ev values to joules?
Yes, negative ev values indicate energy absorption or loss in certain processes. When converting, multiply the negative ev by 1.602e-19, resulting in a negative joule value, representing energy direction or phase in some contexts.
Does temperature affect the ev to joule conversion?
No, the ev to joule conversion relies solely on the charge of an electron and does not depend on temperature. Temperature can influence energy levels in atoms but does not alter the fundamental conversion factor.