Hi Patricia:
I think whenever students sense sincere passion for anything, it gets noticed. Partly because it's somewhat unusual outside o9f certain professions to openly display emotions of any kind, and students are probably more used to less passionate teachers.
Nonetheless, that's no excuse for any teacher to display elements of passion, excitement, enthusiasm, and inspiration in some fashion every day in their delivery and approach to teaching.
But it has to be real. Honesty and genuine belief in what the teacher is discussing helps develop good rapport and stregthens relationships. But trying to be a version of someone other than ourselves will be seen as insincere, and some students may even lose respect for their teacher as the result. Ouch, not a good thing.
Regards, Barry