Mathematical and Physical Journal
for High Schools
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Problem P. 4516. (February 2013)

P. 4516. A domestic appliance is connected to the power station by a wire of resistance 12 ohm. The power of the appliance is 1 kW. What is the efficiency of the transmission of electrical energy in case of 230 V, and in case of 10 kV?

(4 pont)

Deadline expired on March 11, 2013.


Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. A hatásfok 10 kV feszültségnél \(\displaystyle 99{,}99\%\).

Ha a kisebb (230 voltos) feszültség a fogyasztónál mérhető, akkor az energiatovábbítás hatásfoka kb. 81 százalék, ha pedig az erőműnél, akkor csupán 65 százalék lenne.


Statistics:

72 students sent a solution.
4 points:61 students.
3 points:2 students.
2 points:1 student.
1 point:4 students.
0 point:4 students.

Problems in Physics of KöMaL, February 2013