Think of it in this way; a circuit structure is any sort of diagram that demonstrates how a circuit functions where the primary objective is the proper wiring of elements and their relationship to each other rather than physical location relative to one another or intending prototypes. Nevertheless, in some uses classifying diagrams can be challenging so consider this as general information. I've found this is especially true when dealing with more complex circuits and electronics. I'm going to work with a more straightforward but typical industrial circuit because these circuit setups are the exact same, but where it is possible to see how each kind of diagram indicates the role of the circuit in their own manners.
Here's a variant of a diagram. The principle point of this diagram will be to show the logic (referring to electrical management ) of a circuit board. This diagram is the one I mainly come across in my own line of work, and it is extremely successful for troubleshooting problems or learning the way the circuit works. Some circuits are so enormous that many types of schematic diagrams have to be recorded in increments from novel form (typically with coded numbers so that info can be simpler found). Again, here's the same exact circuit because the first 2, but looking at it in ladder shape.
Here's another schematic diagram demonstrating the identical circuit, components and connections and it seems different but they both fall into precisely the identical category.
A design diagram refers to a specific type of circuit design which utilizes standard electrical/electronic symbols instead of pictures to show how a circuit (or part of it) functions. Below is a normal 3-wire motor controller circuit employing a typical short stop halt - start pushbutton station utilizing a schematic diagram. (Momentary this means that the button/switch you activate will go back to its default position once you let go of it, typically by a spring that compels the button/switch to get this done.)
Pictorial schematic diagrams, or pictorial circuit diagrams are essentially the identical thing with exactly the same purpose, but they use pictures of elements within the circuit rather than symbols. Again, here is the exact identical precise circuit (virtually except a control transformer was inserted and they are utilizing conductors L1 and L3 rather than L1 and L2.
Less clutter, right? I have enough information in each of these diagrams to know exactly what this circuit will do and also where to search for problems. Hope that this helps. ( Note: don't confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will often demonstrate pictures of elements such as the pictorial, and how the whole or part of a circuit will be wired. The difference is that wiring diagrams usually place an emphasis on real physical location of necessary components relative to each other that basically tell a layman exactly what to do concerning the wiring. )