Problem P. 4402. (January 2012)
P. 4402. We have 8 Christmas-tree bulbs, rated at 14 V and 3 W, and among old lumbers bulbs rated at 110 V and 10 W, 24 W, 40 W and 60 W are found. Which one should be connected in series with the 8 Christmas-tree bulbs, also connected in series, in order that all the nine bulbs operate properly, when they are connected to a 220 V voltage supply?
(3 pont)
Deadline expired on February 10, 2012.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. A 24 W-os izzót kapcsoljuk sorba.
Statistics:
170 students sent a solution. 3 points: 157 students. 2 points: 10 students. 1 point: 2 students. Unfair, not evaluated: 1 solutions.
Problems in Physics of KöMaL, January 2012