Question

15. () An electric kettle has two heating coils. When one of the coil is switched on the
liquid in the kettle begins to boil in 15 minutes and when the other is switched
on the boiling begins in 18 minutes. In what time will the boiling begin if both
coils are switched on simultaneously i) in series & (ii) in parallel.​

Answer 1

Answer:

in series the time of boiling will increase, in parallel the time which required will be decrease because the heating coil has its own internal resistance and when they are connected in parallel the resistance will decrease then the current flow will increase.