1. Add potassium tartrate and sodium carbonate to a beaker with water.
2. turn on the heater until the solution becomes clear.
3. remove the impurities in the clear solution using filter paper and pour the filtered solution into a container and wait for it to crystallize.
4. Strike the crystallized piezoelectric element and see if it generates electricity.
5. Assemble the piezoelectric element onto a piezoelectric plate.
6. Try tapping the piezoelectric plate with a hammer or hitting it with a ball to turn on the lantern and charge the battery.
| comfort | ⦾ Comfortable |
| age rating | 0+ Everyone |
| storage | 0.2 GB |
| website | training.contentsda.kr |
| developer | ContentsDaInc |
| publisher | ContentsDa Inc |
| connection | Internet not required |
| app version | 1.0 |
| languages |
English ∙ Korean
|