A series circuit will work if there is a closed path through which the current can pass, and a voltage source. Otherwise it won't.
No. Series circuit has 1 path to flow.
in a series circuit or it will not work. Put it after the bulb
A decrease in current.
because the circuit is not a full circuit so it wont work!
If there is only one fan in the circuit then it is in a series circuit. If there is more that one fan then they will be connected in a parallel configuration.
All of the light bulbs in the series circuit would go out.
In that case, the entire circuit won't work.
Diverging Circuit
The meaning of "differently lighted up" is very unclear. As long as all the bulbs in a series circuit are connected to the circuit, and all of the bulbs have good filaments with no holes in them, current will flow in the circuit. Depending on the ratings of each bulb, the current may not be enough to cause all of them to glow visibly, but there will certainly be a current. That may or may not suit your definition of "work".
No. Since the switch is in series with the circuit, opening it blocks the current flow through the circuit, turning it off.
There are four types of circuit: series, parallel, series-parallel, and complex.
A series circuit is actually in series, but a parallel circuit, is Parallel