| Water Treatment | Purification of water to make it suitable for drinking or for any other use. |
| Charcoal | A drawing pencil or crayon made from this material. |
| Activated Carbon | Powdered or granular carbon used for purifying by adsorption; given orally (as a slurry) it is an antidote for some kinds of poisons. |
| Solar Power System | The conversion of the energy of the sun's radiation to useful work. |
| Voltage Regulator | A device that maintains the terminal voltage of a generator or other voltage source within required limits despite variations in input voltage or load. Also known as automatic voltage regulator; voltage stabilizer. |
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