Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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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.


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