Yes. While you have the option to stream from your own laptop or tablet device by connecting to the projector/display in the classroom, streaming via Zoom using the instructor PC next to the lectern at the front of the room is preferred. This will provide a better experience by taking advantage of the built-in cameras and wireless microphone systems in the room.
If you do choose to use your own device to stream in the classroom, you will still need to log into the Zoom PC and start your meeting, then connect your laptop as a video source.