A energia é a capacidade de realizar o trabalho.Existe de várias formas, como cinético, potencial, térmica, etc. É medido em joules (J).
1 eV = 1.6022e-22 kW 
1 kW = 6,241,495,961,752,113,000,000 eV 
Exemplo: 
Converter 15 Electronvolt para Quilowatt:
15 eV = 2.4033e-21 kW 
| Electronvolt | Quilowatt | 
|---|---|
| 0.01 eV | 1.6022e-24 kW | 
| 0.1 eV | 1.6022e-23 kW | 
| 1 eV | 1.6022e-22 kW | 
| 2 eV | 3.2044e-22 kW | 
| 3 eV | 4.8065e-22 kW | 
| 5 eV | 8.0109e-22 kW | 
| 10 eV | 1.6022e-21 kW | 
| 20 eV | 3.2044e-21 kW | 
| 30 eV | 4.8065e-21 kW | 
| 40 eV | 6.4087e-21 kW | 
| 50 eV | 8.0109e-21 kW | 
| 60 eV | 9.6131e-21 kW | 
| 70 eV | 1.1215e-20 kW | 
| 80 eV | 1.2817e-20 kW | 
| 90 eV | 1.4420e-20 kW | 
| 100 eV | 1.6022e-20 kW | 
| 250 eV | 4.0054e-20 kW | 
| 500 eV | 8.0109e-20 kW | 
| 750 eV | 1.2016e-19 kW | 
| 1000 eV | 1.6022e-19 kW | 
| 10000 eV | 1.6022e-18 kW | 
| 100000 eV | 1.6022e-17 kW |