KöMaL - Középiskolai Matematikai és Fizikai Lapok
Sign In
Sign Up
 Magyar
Information
Contest
Journal
Articles

 

Problem P. 4195. (November 2009)

P. 4195. The voltage of the power supply of the circuit shown in the figure is 15 V. When the switch is open the voltmeter reads 10 V and the ammeter reads 200 mA.

a) Find the resistances of all the resistors.

b) What are the readings of the meters when the switch is closed?

c) Find the dissipated power at each resistor when the switch is open and when it is closed.

(3 pont)

Deadline expired on 10 December 2009.


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

Megoldás. \(\displaystyle a)\) \(\displaystyle R_{1}=50~\Omega,\) \(\displaystyle R_{2}=25~\Omega.\)

\(\displaystyle b)\) 300 mA, illetve 15 V.

\(\displaystyle c)\) Nyitott kapcsolóállásnál \(\displaystyle P_{1}=2~\)W, \(\displaystyle P_{2}=1~\)W; zárt állásnál \(\displaystyle P_{1}=4,5~\)W, \(\displaystyle P_{2}=0.\)


Statistics:

200 students sent a solution.
3 points:111 students.
2 points:59 students.
1 point:19 students.
0 point:9 students.
Unfair, not evaluated:2 solutions.

Our web pages are supported by:   Ericsson   Cognex   Emberi Erőforrás Támogatáskezelő   Emberi Erőforrások Minisztériuma   Nemzeti Tehetség Program    
MTA Energiatudományi Kutatóközpont   MTA Wigner Fizikai Kutatóközpont     Nemzeti
Kulturális Alap   ELTE   Morgan Stanley