Mathematical and Physical Journal
for High Schools
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Problem P. 4128. (January 2009)

P. 4128. The pressure of the water supply of a city is maintained by a 24-m high water column. What is the daily electrical energy consumption of a city which has 50 000 citizens if the average water consumption of a citizen is 100 litres per day, the efficiency of the pumps is 80%, and the efficiency of the electric motors is 92%?

What is the average electrical power input of the water plant?

(4 pont)

Deadline expired on February 11, 2009.


143 students sent a solution.
4 points:115 students.
3 points:10 students.
2 points:2 students.
1 point:8 students.
Unfair, not evaluated:8 solutions.

Problems in Physics of KöMaL, January 2009