This is the 10450th most frequent Polish word.
czujnika
"Sensor."
Here, 'czujnika' is used as the genitive singular form of 'czujnik', meaning 'sensor', to indicate possession in 'operation of the sensor'.
Działanie czujnika było kluczowe dla sukcesu misji.
The operation of the sensor was crucial for the mission's success.
In this sentence, 'czujnika' is the genitive singular form used after 'do', which is a preposition that requires the genitive case.
Podłączyłem przewody do czujnika.
I connected the cables to the sensor.
Here, 'czujnika' is used in the genitive singular to modify the noun 'użycie', denoting what was used.