Problem P. 4368. (September 2011)

P. 4368. Two resistors of resistances 1 k $\Omega$ and 4 k $\Omega$ are connected in series to a 220 V voltage supply of negligible internal resistance. Across the 4 k $\Omega$ resistor a moving coil voltmeter reads 147 V. What would be the reading on this voltmeter if it was connected to measure the voltage across the other resistor?

(4 pont)

Deadline expired on October 10, 2011.

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

Megoldás. A mért feszültség kb. 2/3-a a tápfeszültségnek, tehát a műszer és a 4 k$\displaystyle \Omega$-os fogyasztó párhuzamos eredője 2 k$\displaystyle \Omega$, a műszer ellenállása pedig 4 k$\displaystyle \Omega$.

Ha a műszert az 1 k$\displaystyle \Omega$-os fogyasztóra kapcsoljuk, eredő ellenállásuk 0,8 k$\displaystyle \Omega$ lesz. Ez a teljes ellenállás 16,7 százaléka, a mért feszültség tehát 36,7 V.

Statistics:

120 students sent a solution.

4 points: 72 students.

3 points: 8 students.

2 points: 16 students.

1 point: 12 students.

0 point: 8 students.

Unfair, not evaluated: 4 solutionss.

Problems in Physics of KöMaL, September 2011

120 students sent a solution.
4 points:	72 students.
3 points:	8 students.
2 points:	16 students.
1 point:	12 students.
0 point:	8 students.
Unfair, not evaluated:	4 solutionss.

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