I am a new user of LR. I have an iMac, OS 10,10,4 and PS CC and LR CC latest versions. I really like the quick adjustments that can be made in the Develop module. When do these adjustments get transferred to the original photo or do they get transferred. I make the adjustments in LR and then look at the image in Finder and nothing has changed with the original and there are no copies of the original.. When I open the photos in PS it is just like starting over with the adjustments. What am I doing or not doing correctly?
That is the concept of LR - non-destructive.
Your originals always stay untouched. To see the results with an external program you need to export, where your edits are "baked-in".
And here is how to travel to PS from LR to edit and come back to LR ... https://helpx.adobe.com/lightroom/help/editing-photoshop-or-photoshop-elements.html