Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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I want the old design back!!! :-)

Problem P. 3973. (April 2007)

P. 3973. Because of the hot weather air-condition was on for about 3 hours every day in July. The rate of energy absorbed from the room is 1800 W, the device is operated from a voltage of 230 V such that the useful rate of energy of the device is 240% of the rate of energy drown from the power supply. How much does the monthly bill increased if the price of 1 kWh energy is 36 Ft.

(3 pont)

Deadline expired on May 11, 2007.


113 students sent a solution.
4 points:Kecsmárszky György, Molontay Roland, Perjés Barnabás.
3 points:71 students.
2 points:25 students.
1 point:5 students.
0 point:1 student.
Unfair, not evaluated:8 solutions.

Problems in Physics of KöMaL, April 2007