 |
| voltage control: 116 phrases in 26 subjects |
| Astronautics | 3 |
| Automated equipment | 3 |
| Automatic control | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Caspian | 1 |
| Computer networks | 1 |
| Electrical engineering | 23 |
| Electronics | 6 |
| Energy industry | 8 |
| Energy system | 6 |
| General | 1 |
| Information technology | 6 |
| Mass media | 1 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Military | 1 |
| Nautical | 1 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 1 |
| Physics | 1 |
| Rail transport | 1 |
| Technology | 40 |
| Telecommunications | 4 |
| Transport | 1 |
| Welding | 1 |