Question

Why do the lighting system in your building have parallel circuits instead of series circuits?

Answer 1

There are two reasons of connecting lighting system in parallel in our building.

(i) Consider the situation when the lighting bulbs are connected in series. If any one of the bulb is damaged (means open circuited) then current will not flow through the whole circuit and not a single bulb will able to glow.

(ii) Second reason is that, in series circuit when we add the bulbs, means we are increasing the resistance linearly.

Because in series circuit, total resistance = R1 + R2 + R3 + R4 +.............................

Our voltage is fixed, so the resulting current will be low and the bulbs will get dimmer.

Therefore, these are the two reasons why we connect the lighting system in our building in parallel not in series.