Pictorial schematic diagrams, or graphic circuit diagrams are essentially the exact same thing with exactly the identical purpose, but they use images of elements within the circuit instead of symbols. Again, here's the same exact circuit (virtually except a control transformer was added and they're using conductors L1 and L3 instead of L1 and L2.
Following is a variant of a diagram called a ladder structure. The main goal of this diagram will be to show the logic (speaking to electric control) of a circuit. This really is the one that I mostly come across in my line of work, and it is extremely effective for troubleshooting problems or learning the way the circuit functions. Some circuits are so enormous that many kinds of schematic diagrams need to be read in increments in novel form (generally with coded numbers so that information can be easier found). Again, here's the same precise circuit because the first two, but looking at it in ladder type.
Here is another schematic diagram showing the identical circuit, components and connections and it looks different but they fall into precisely exactly the same category.
Right, Less clutter? I've got enough info in all these diagrams to know precisely what this circuit does and also where to search for problems. Hope this helps. ( Note: don't confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will typically show images of elements like the pictorial, and how the whole or portion of a circuit is wired. The difference is that wiring diagrams generally place an emphasis on actual physical place of necessary components relative to each individual that basically tell a layman Just What to do concerning the wiring. )
Consider it this way; a circuit diagram is any type of diagram which illustrates how a circuit functions where the most important objective is that the proper wiring of components and their connection to each other rather than physical place relative to each other or planning prototypes. Nonetheless, in some uses classifying diagrams can be difficult so do this as overall information. I've found this is particularly true when working with more complex circuits and electronics. I'm going to use a more straightforward but average industrial circuit because these circuit setups are exactly the same, but yet where you're able to see how each kind of diagram shows the function of the circuit in their own manners.
A design diagram refers to a specific kind of circuit structure that utilizes standard electrical/electronic symbols rather than images to demonstrate the way the circuit (or portion of it) works. Below is a normal 3-wire motor controller circuit utilizing a typical momentary halt - start pushbutton station employing a schematic diagram. (Momentary this means that the button/switch you trigger will go back to its default location once you let go of it, typically by a spring that compels the button/switch to do this.)