I'm reading "Beginner's Guide to Reading Schematics" by Stan Gibilsco.

Here is one quote:"The basic process used to make all electronic circuits breaks down into a sequence of combinations. First, the individual components (resistors, capacitors, diodes, and so on) combine to form simple circuits. Then, simple circuits combine to make more complex circuits. After that, complex circuits combine to form complete devices".

There is also example of one complex circuit, which consists of few simpler circuits connected in cascade.

Although this concept of combining simple circuits to get some complex circuit sounds very logical, there is one problem. Every simple circuit which would be used (combined with other simple circuits) to form complex circuit has some function: how can we know that after connecting simple circuits together,

Here is one quote:"The basic process used to make all electronic circuits breaks down into a sequence of combinations. First, the individual components (resistors, capacitors, diodes, and so on) combine to form simple circuits. Then, simple circuits combine to make more complex circuits. After that, complex circuits combine to form complete devices".

There is also example of one complex circuit, which consists of few simpler circuits connected in cascade.

Although this concept of combining simple circuits to get some complex circuit sounds very logical, there is one problem. Every simple circuit which would be used (combined with other simple circuits) to form complex circuit has some function: how can we know that after connecting simple circuits together,

**function of these simple circuits would not change**? Are there some conditions that must be met in order for this strategy (look at quote) to work? It looks to me that in general this strategy would not work. I used google to find answer and I think that my question has something with "Loading effect" but I'm not sure.
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