I am wondering about the main differences between architecture with the others branch of engineering such as civil, mechanic, electricity....etc

Sabeeh,

Your inquiry has a few emerging questions that are being answered by the construction industry without input by either A or E of the design professions. Today the institutional and governmental client seeks no risk nor new staff when it comes to construction contracting. They offer projects to construction administrators who absorb all risk, who employ the A/E talent, solicit bids from subcontractors for the major trades. They become the client in effect and offer the keys to the building owner when its complete. The owner typically hires an owners rep to inspect and interact with all the professionals and trades with and in concert with the prime contractor.

Each engineer is responsible to the public via code requirements; to the prime design firm if they are consultants to an architect for instance; or they may have their allegiance to any other entity already mentioned. The engineer of a bridge or waste water facility will be the prime design firm and use architects as consultants. That's for the overall project.

For the constructors, whether the prime or subs, or product fabricators the same can be repeated in house or by outside consultants. Their duplicating roles assure the individual product for a system will meet specs from the project design team and the mfg. production / engineering capacity.

Think of each level as essential for the parts that combine to make the whole. Who becomes responsible for the whole or holistic result is the one under contract to do so for the owner and that responsible entity can be anyone of the major design professions or the constructor.

Now add another popular player that is a construction management consultant that stands in lieu of the owner and has the baton of an orchestra conductor. All of the others will assume their key roles and work for that firm under contract.

If you are asking what does each type of engineer do on the various arranged teams its much clearer roles based on their professional licensing: so electricity for any all all will be speced and designed by an EE, fluids like water etc and chemicals in a plant by a mechanical engineer ( ME )with general or specialized processes i.e. air conditioning or latex plant manufacturing. ME can be also designing with rocket scientists or city water supplies, and oil drilling.. The civil engineer can do all of the work of public engineering of roads, reservoirs, mining, fortifications, and a specialty does structural systems.

Historically the architect was the master builder who knew all trades and the specialized trade builders knew their guild dominated field ie: masonry, doors and windows, timber framing, aqueducts, tunneling, plumbing with lead (plumb)pipes.

For a good autobiography read Louis Sullivan of Chicago. Who wrote of the way he decided to be the one who dreams of what has never been instead of the one who analyzed the dream to find out if it will fall down. He possessed both skill sets of the structural engineer and the architect so he chose to dream of what could stand and his work starred the Chicago School.