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Granville Woods :)
No-one created circuit symbols; they evolved over time. And, in fact, different countries use different standards for their symbols so US standard symbols, for example, are different from European standards.
One rooster, one hen, and an incubator.
Depends on if you have a broody hen. If the hen is brooding then you do not need to incubate, if you have no natural brooder then yes, an incubator is needed.
a schematic circuit is a diagram that show you how a particular circuit works
It is often necessary to wire crossing
The advantages are the same as using symbols in writing to represent the words.
circuit is a schematic which explains some operation using some symbols. circuit configuration is giving a detailed explanation about its parameters
Not always. Depends on the circuit.
what is the function of incubator
what is the function of incubator