it would be kind of both
a normally open device simply means that it is open (or it is an incomplete circuit) in its normal state and when the normal state changes it closes, either instantaneously or stays closed in a latch mode. a normally open device can be wired in series or parallel depending on what your purpose is.
Homes are wired in parallel because of basic electrical theory. If something in a series circuit fails, the electrons cannot flow anymore. The WHOLE circuit is now down. Also, the voltage would drop after every resistance. A breaker is on each separate circuit in your house as protection. Those separate circuits are broken down even more as parallel circuits. When you unplug something, the whole circuit isn't affect (well, current, but you can still use your other electronics). Also, voltage must be at a certain level for all our things. In series, the resistance would lower the voltage, which can harm electronics designed for higher voltages.
If a circuit is wired in parallel, all the bulbs have their own independent access to electricity, so if one bulb goes out, the others are not affected. If the circuit is wired in series, then one bulb going out will block the current to all the other bulbs as well.
The brightness would remain constant but the power draw will increase. If the circuit was series wired, the brightness would go down as you added bulbs.
A "synapse" is the gap between neurons in the brain. Since the brain is not hard wired, and the neurons are only connected by a chemical synapse, the brain can be "re-wired" to act in a way it did not before. This is how we are able to learn and perfect new skills.
House lights are wired in parallel. If they were in series, when one burned out, all would. Christmas lights are wired in a combination of series and parallel - roughly 50 lights in each series string. that's why if one bulb burns out, a section of the lights goes out.
Everything in a house is wired in parallel. If you had lights is series when one burns out they would all go out, much like cheap Christmas lights.
Your house wiring, Christmas lights (usually ~50 are in series, so if you have a string of 200, you have 4 parallel groups of 50 series lights), sound systems using multiple speakers on a single channel (usually wired in parallel, but could be in series depending on speaker and amp spec).
Always parallel. Homes should never be wired in series. (That would be like the old Christmas tree lights where, if one bulb burned out, the entire string would not light up.)
Houshold circuits, like all non-trivial circuits, are wired in series-parallel. Switches are in series with loads. Loads, and switches with loads as combined units, are in parallel with each other.
In parallel.
paralell
So you don't have to turn on all the lights at the same time.
Unscrew any lamp or disconnect any appliance. If the house is connected in series, everything else in the house will stop working!
series
the paralel
series