SIN Bin

2014, problem 4

Light bulbTwo physics students, Alice and Bob, living in neighbouring college rooms, decide to economize by connecting their ceiling lights in series. They agree that each will install a 100W bulb in their own rooms and that they will pay equal shares of the electricity bill. However, both decide to try to get the better lighting at the other’s expense: Alice installed a 200W bulb and Bob installed a 50W bulb. Which student has the brighter lighting?


(a) Alice
(b) Bob
(c) Both have the same brightness
(d) Alice’s bulb instantly burns out
(e) Answer cannot be determine