full transcript
From the Ted Talk "Harald Haas: Forget Wi-Fi. Meet the new Li-Fi Internet"

#### Unscramble the Blue Letters

A solar cell absorbs light and converts it into ratlelceic egyren. This is why we can use a solar cell to charge our oblime phone. But now we need to remember that the tdaa is encoded in subtle changes of the brightness of the LED, so if the incoming light fluctuates, so does the energy harvested from the solar cell. This means we have a principal mechanism in place to receive information from the ihglt and by the solar cell, because the fluctuations of the energy aredstvhe correspond to the data transmitted.

#### Open Cloze

A solar cell absorbs light and converts it into __________ ______. This is why we can use a solar cell to charge our ______ phone. But now we need to remember that the ____ is encoded in subtle changes of the brightness of the LED, so if the incoming light fluctuates, so does the energy harvested from the solar cell. This means we have a principal mechanism in place to receive information from the _____ and by the solar cell, because the fluctuations of the energy _________ correspond to the data transmitted.

1. mobile
2. light
3. energy
4. harvested
5. electrical
6. data

#### Original Text

A solar cell absorbs light and converts it into electrical energy. This is why we can use a solar cell to charge our mobile phone. But now we need to remember that the data is encoded in subtle changes of the brightness of the LED, so if the incoming light fluctuates, so does the energy harvested from the solar cell. This means we have a principal mechanism in place to receive information from the light and by the solar cell, because the fluctuations of the energy harvested correspond to the data transmitted.

#### ngrams of length 2

collocation frequency
solar cell 19
solar cells 6
li fi 4
led lamp 4
energy harvesting 3
energy harvested 3
cells integrated 3

#### ngrams of length 3

collocation frequency
solar cells integrated 3

#### Important Words

1. absorbs
2. brightness
3. cell
4. charge
5. converts
6. correspond
7. data
8. electrical
9. encoded
10. energy
11. fluctuates
12. fluctuations
13. harvested
14. incoming
15. information
16. led
17. light
18. means
19. mechanism
20. mobile
21. phone
22. place
23. principal