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?
Deadline expired on 11 February 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.|