Question

name the physical quantity which remains same and different when bulbs -
a) of same wattage are connected in series
b) same wattage are connected in parallel
c) different wattage in series
d) different wattage in parallel​

Answer 1

c) Different wattage are connected in series: If wattage is different with same voltage rating then resistance will be different then potential drop also differs. Only electric current remains same.

Answer 2

So the answer would be :

a)Physical quantity which remains same when some wattage are connected in series :

--->Same wattage , so same voltage then same resistance

--> Same voltage drop means same voltage drop across the bulbs.hence current, potential drop, resistance and luminosity of bulb remains same

Different ---none

b)Same wattage are connected in parallel:Answer would be : same potential drop, current and resistance.Different

--none

c) Different wattage are connected in series:

If wattage is different with same voltage rating then resistance will be different then potential drop also differs.Only electric current remains same.

d)Different wattage are connected in parallel:

If wattage is different with same voltage then the resistance are different too . Current also differs .Luminosity also differs.