| energy | | |
| Energy is a physical value which expresses a body´s ability to do work | | |
| various forms of energy | | |
| Use the units of energy and their conversion ratios | | |
| light energy | | |
| nuclear energy | | |
| chemical energy | | |
| energy of tidal effects | | |
| law of preservation of energy | | |
| One type of energy can only transform into another | | |
| biomass energy | | |
| non-renewable and renewable sources of energy | | |
| source of energy | | |