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.
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.