Next is an example of two types of circuits.
Parallel and series.
It is a wee bit complicated if you start to figure out the math involved as to why you would do one and not the other.
But those formulas were given in the ohms laws section.
The top A is parallel the bottom B is series.
Remember those old Christmas lights if one burns out they all stop working.
That was because they were in series.
The power had to go through each light to complete the circuit for all of the lights.
With a parallel circuit all of the lights share the same power.
If one light goes out the rest work.
This is why with the above drawing I said it was for only one light.
To go even farther you can have a series parallel circuit.
This would be where you would drop a light on the circuit in parallel or series anywhere in the given circuit.
Wiring 2.jpg