Is the ich pronounced like the German "ich"?
Depends on where in Germany you are :) It's not like the standard pronunciation of German ich, where the "ch" is pronounce differently than in the word ach.
But in southern Germany, where the standard ich-sound doesn't exist and they use the ach-sound for all occurrences of ch, it will sound similar to in Polish.
In IPA, standard German ich is [ɪç] while Polish ich is [ix].
Yes indeed, I was referring to the Voiceless Palatal Fricative German ich, but now I understand, hopefully rightly, that the Polish ch is rather Voiceless Velar Fricative. Thanks. Also for anyone who might be wondering about this: https://en.wikipedia.org/wiki/Polish_phonology#Consonants
It would be dependent on the grammatical gender of the Polish word for the specific thing you have in mind.
If "it" is a car, which is masculine in Polish (samochód), then "its power" = "jego moc". Same if the noun is neuter (urządzenie = device). If "it" is "a machine" (maszyna, feminine), then "its power" = "jej moc".