Kühlschrank vs. Gefrierschrank
About points...
We associate a certain number of points with each exercise.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
About difficulty...
We associate a certain difficulty with each exercise.
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
Question
Solution
Short
Video
\(\LaTeX\)
Need help? Yes, please!
The following quantities appear in the problem:
Temperatur \(T\) / Wärme \(Q\) / Leistungszahl \(\epsilon\) /
The following formulas must be used to solve the exercise:
\(\varepsilon = \dfrac{T_{\scriptscriptstyle\rm L}}{T_{\scriptscriptstyle\rm H}-T_{\scriptscriptstyle\rm L}} \quad \) \(\epsilon = \frac{Q_L}{Q_H-Q_L} \quad \)
No explanation / solution video to this exercise has yet been created.
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Visit our YouTube-Channel to see solutions to other exercises.
Don't forget to subscribe to our channel, like the videos and leave comments!
Exercise:
In einer Küche TwO steht ein Kühlschrank dessen Innentemperatur auf TkO gehalten wird. abcliste abc Welche Leistungszahl könnte er maximal haben? abc Wie gross könnte die Leistungszahl höchstens sein wenn bei derselben Raumtemperatur der Kühlschrank als Gefrierschrank mit Innentemperatur TfO genutzt wird? abcliste
Solution:
Geg T_w Tw T_k Tk T_k Tf abcliste abc GesLeistungszahlepsilon_KS Die maximal mögliche Leistungszahl einer Kältemaschine ist epsKS dfracT_kT_w-T_k wobei die Temperaturen in Kelvin einzusetzen sind: T_w TwKF Tw + . TwK T_k TkKF Tk + . TkK epsilon_KS fracT_kT_w - T_k fracTkKFTwKF - TkKF epsAF fracTk - -fracTw - Tk epsA approx epsAP epsilon_KS epsAF epsAP abc Im zweiten Fall ist die Leistungszahl T_k TfKF Tf + . TfK epsilon_KS fracT_kT_w - T_k fracTfKFTwKF - TfKF epsBF fracTf - -fracTw - Tf epsB approx epsBP epsilon_KS epsBF epsBP abcliste
In einer Küche TwO steht ein Kühlschrank dessen Innentemperatur auf TkO gehalten wird. abcliste abc Welche Leistungszahl könnte er maximal haben? abc Wie gross könnte die Leistungszahl höchstens sein wenn bei derselben Raumtemperatur der Kühlschrank als Gefrierschrank mit Innentemperatur TfO genutzt wird? abcliste
Solution:
Geg T_w Tw T_k Tk T_k Tf abcliste abc GesLeistungszahlepsilon_KS Die maximal mögliche Leistungszahl einer Kältemaschine ist epsKS dfracT_kT_w-T_k wobei die Temperaturen in Kelvin einzusetzen sind: T_w TwKF Tw + . TwK T_k TkKF Tk + . TkK epsilon_KS fracT_kT_w - T_k fracTkKFTwKF - TkKF epsAF fracTk - -fracTw - Tk epsA approx epsAP epsilon_KS epsAF epsAP abc Im zweiten Fall ist die Leistungszahl T_k TfKF Tf + . TfK epsilon_KS fracT_kT_w - T_k fracTfKFTwKF - TfKF epsBF fracTf - -fracTw - Tf epsB approx epsBP epsilon_KS epsBF epsBP abcliste
Meta Information
Exercise:
In einer Küche TwO steht ein Kühlschrank dessen Innentemperatur auf TkO gehalten wird. abcliste abc Welche Leistungszahl könnte er maximal haben? abc Wie gross könnte die Leistungszahl höchstens sein wenn bei derselben Raumtemperatur der Kühlschrank als Gefrierschrank mit Innentemperatur TfO genutzt wird? abcliste
Solution:
Geg T_w Tw T_k Tk T_k Tf abcliste abc GesLeistungszahlepsilon_KS Die maximal mögliche Leistungszahl einer Kältemaschine ist epsKS dfracT_kT_w-T_k wobei die Temperaturen in Kelvin einzusetzen sind: T_w TwKF Tw + . TwK T_k TkKF Tk + . TkK epsilon_KS fracT_kT_w - T_k fracTkKFTwKF - TkKF epsAF fracTk - -fracTw - Tk epsA approx epsAP epsilon_KS epsAF epsAP abc Im zweiten Fall ist die Leistungszahl T_k TfKF Tf + . TfK epsilon_KS fracT_kT_w - T_k fracTfKFTwKF - TfKF epsBF fracTf - -fracTw - Tf epsB approx epsBP epsilon_KS epsBF epsBP abcliste
In einer Küche TwO steht ein Kühlschrank dessen Innentemperatur auf TkO gehalten wird. abcliste abc Welche Leistungszahl könnte er maximal haben? abc Wie gross könnte die Leistungszahl höchstens sein wenn bei derselben Raumtemperatur der Kühlschrank als Gefrierschrank mit Innentemperatur TfO genutzt wird? abcliste
Solution:
Geg T_w Tw T_k Tk T_k Tf abcliste abc GesLeistungszahlepsilon_KS Die maximal mögliche Leistungszahl einer Kältemaschine ist epsKS dfracT_kT_w-T_k wobei die Temperaturen in Kelvin einzusetzen sind: T_w TwKF Tw + . TwK T_k TkKF Tk + . TkK epsilon_KS fracT_kT_w - T_k fracTkKFTwKF - TkKF epsAF fracTk - -fracTw - Tk epsA approx epsAP epsilon_KS epsAF epsAP abc Im zweiten Fall ist die Leistungszahl T_k TfKF Tf + . TfK epsilon_KS fracT_kT_w - T_k fracTfKFTwKF - TfKF epsBF fracTf - -fracTw - Tf epsB approx epsBP epsilon_KS epsBF epsBP abcliste
Contained in these collections
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Leistungszahl Kältemaschine 2 by TeXercises
| Title | Matched on |
|---|---|
| Wärmepumpe im Winter | tagsformula |
| Reale Leistungszahlen von Kältemaschinen | tags |
| Kältemaschine QL [kWh] | tags |
| Wärmeentzug von Kältemaschine | tags |
| Kühlschrank im Restaurant | tags |