Explain why buildings are wired using parallel circuits rather than series circuit?

Answer 1

A simple example, and it basically relates to buildings, is in Christmas lights strewn on the Christmas tree. If your Christmas lights are in series, if one bulb becomes duff, all the other bulbs also go out. So which bulb is duff (dead)? By testing each bulb you will eventually find the duff bulb and replace it.
If the Christmas lights had been parallel, one duff bulb would not affect the other bulbs. It would be very apparent that the only dud bulb (not lit) in the parallel circuit needed to be replaced.

Answer 2

There are two reasons.

The first, and more important, is that, with parallel circuits, the supply voltage appears across every load -i.e. each load is subject to exactly the same voltage. If loads were connected in series, then the voltage appearing across each load would be proportional to their resistance or impedance, and that value would be anyone's guess! If the loads were, say, lamps, then they would all operate at different brightnesses.

The second reason is that if loads were connected in series then, if one load became open circuited, then ALL the loads would become disconnected and cease to work.

Answer 3

So all devices get the same voltage. Circuits can be switched on and off independently of each other. If a device, e.g.light, fails no other circuits are lost.