Unless you do not have enough space in the service panel it is always a good idea to have each room on it's own circuit. If you want to put 2 rooms on a circuit just make sure those 2 rooms do not overload the circuit and wire it for a 20 amp circuit. Two bedrooms with 8 outlets each and 1 light each is about all you would want on the circuit. I would never put 3 rooms on the same circuit.
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You need to address this from the prospective of current draw per light. The length is not really the issue. Your continuous current should not exceed 80% of 20 amps, or 16 amps. Now if you were using certain halogen bulbs the current for each might be 1/2 amp each so you could have 32 such bulbs. Do a sample layout in what is called a reflected ceiling plan (Imagine the ceiling plan on the floor) and see how many lights of what current you plan to use and break up your circuit as needed.
a schematic circuit is a diagram that show you how a particular circuit works
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Up to 12 on a 20 amp circuit. Up to 9 on a 15 amp circuit. But use common sense. If the circuit will be heavily loaded, as in a home office, then do not install that many.
There are many applications of this acceptor circuit. You can learn more about them with some electrical training programs.