I am a visitor from Electronics.SE, where we often discuss the schematics for various devices. Mostly asking a user to post the schematics, because it is impossible to follow someone's thoughts without it.
Since English is not my native language, I have had a hard time understanding the difference between schematic and schematics. Initially I assumed that schematics is the plural form of schematic, but it did not take long to realize that schematics is being used even when there's only one page or circuit.
What are the rules governing the usage of this word? Does it belong to a specific type of words with a fancy name that I can search for?