Problem P. 4505. (January 2013)
P. 4505. The values the resistance of the resistors connected to the voltage supply of U=120 V, as shown in the figure are unknown. When the switch is closed the reading on the voltmeter changes by 16 V, and the power dissipated by the resistor R_{1} changes by 51.2 W.
a) Using the condition given to the change in the voltage determine the ratio of the resistances: R_{1}/R_{2}.
b) What are the values of the resistance of the resistors R_{1} and R_{2}?
(4 pont)
Deadline expired on February 11, 2013.
Sorry, the solution is available only in Hungarian. Google translation
Megoldásvázlat. \(\displaystyle a)\) \(\displaystyle R_1/R_2=2\) vagy 1/4.
\(\displaystyle b)\) \(\displaystyle R_1=55~\Omega\) és \(\displaystyle R_2=27{,}5~\Omega\) vagy \(\displaystyle R_1=20~\Omega\) és \(\displaystyle R_2=80~\Omega\).
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80 students sent a solution.  
4 points:  54 students. 
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2 points:  6 students. 
1 point:  3 students. 
