Consider it in this way; a circuit structure is any type of diagram that illustrates how a circuit operates where the most important goal is that the appropriate wiring of elements and their relationship to each other rather than physical place relative to one another or planning prototypes. However, in some uses classifying diagrams can be hard so accept this as general information. I have found this is particularly true when working with more complex circuits and electronics. I'm going to use a simpler but typical industrial circuit because these circuit set ups are the exact same, but nevertheless where you're able to see how each sort of diagram shows the function of the circuit in their own ways.
A schematic diagram refers to a particular type of circuit design which utilizes standard electrical/electronic symbols rather than pictures to demonstrate how a circuit (or a part of it) works. Below is a standard 3-wire motor controller circuit employing a typical short stop stop - start pushbutton station working with a schematic diagram. (Momentary this means the button/switch you activate will go back to its default place once you physically let go of it, usually by a spring which forces the button/switch to get this done.)
Here's another schematic diagram demonstrating exactly the identical circuit, components and connections and it appears different but they both fall into precisely the same category.
Pictorial design diagrams, or pictorial circuit diagrams are essentially the exact same thing with exactly the exact identical function, however they use pictures of elements inside the circuit instead of symbols. Again, here is the identical precise circuit (almost except a control transformer was included and they're using conductors L1 and L3 rather than L1 and L2.
Following is a variant of a schematic diagram. The main purpose of this diagram is to demonstrate the logic (referring to electric control) of a circuit. This diagram is the one that I mostly come across in my line of work, and it's extremely successful for troubleshooting issues or learning the way the circuit works. Some circuits are so huge that many types of schematic diagrams need to be recorded in increments in book form (normally with coded numbers so information can be simpler located ). Again, here's the exact identical exact circuit since the first two weeks, but looking at it in ladder type.
Right, Less mess? I've got enough info in each one of these diagrams to know just what this circuit does and where to search for problems. Hope this helps. ( Note: don't confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will typically demonstrate pictures of components like the pictorial, and how the whole or part of a circuit is wired. The distinction is that wiring diagrams usually place an emphasis on real physical location of necessary elements relative to each other that basically tell a layman exactly what to do concerning the wiring. )