Video

Siemens Stiftung

Cómo mejorar el rendimiento de una pila (sin subtítulos)

Video (04:33 minutos, sin sonido):
El experimento con un elemento de Cu y Zn muestra que la pila solo alcanza su pleno rendimiento en presencia de iones de Cu2+.


A menudo se entiende equivocadamente la combinación de dos metales como una característica esencial de los elementos electroquímicos (pilas, baterías, acumuladores). Pero un elemento se compone en realidad de una combinación de dos pares redox metálicos. La pila de cinc y cobre, frecuentemente empleada en la clase con alguna fruta, verdura o con ácido y agua salada, es en realidad un elemento de cinc e hidrógeno (Zn/Zn2+ e H/H+). El voltaje y la potencia son por ello inferiores a los valores para Zn y Cu. Solo se convierte en un elemento de Zn y Cu (Zn/Zn2+ y Cu/Cu2+) cuando en la semicelda de cobre hay presentes también iones de cobre procedentes del sulfato de cobre. El elemento alcanza ahora el máximo voltaje y potencia.

En el Portal de medios didácticos se encuentra también una versión de la película que ofrece explicaciones de algunas escenas en forma de subtítulos: "Cómo mejorar el rendimiento de una pila (con subtítulos)?.

Indicaciones e ideas:
Las Instrucciones sobre experimentación "A3 Pila de limón y otras pilas? contiene dos experimentos parciales (4 y 5) que trabajan con sulfato de cobre. No obstante, por razones de seguridad, algunos profesores prefieren no llevar a cabo experimentos con sulfato de cobre en el aula de clase. El profesor puede proyectar en ese caso este video con el experimento parcial 4 de manera alternativa. De esa forma es posible comprender sistemáticamente el experimento en su conjunto, que consta de experimentos parciales estructurados en muchos pasos didácticos.
Debe indicarse a los alumnos que el experimento simplificado del video trabaja sin separador. En el experimento parcial 4 del medio "A3 Pila de limón y otras pilas (Instrucciones para los alumnos)?, que se encuentra en el portal de medios didácticos, hay instrucciones de experimentación detalladas. La explicación técnica se encuentra en el medio "A3 Pila de limón y otras pilas (Instrucciones didácticas)?.

Audio

Siemens Stiftung

Kann man digitale Daten hören?

Ton:Sind digitale Daten zu hören?Ein digitales Telefongespräch (DSL, ISDN) wird als Tonfrequenz übertragen. Wenn man das Übertragungssignal abhört, ist allerdings nur ein unverständliches Zwitschern hörbar. Denn das Signal ist ja digitalisiert und binär codiert. Am Anfang hört man den “Wählton”, die Abfolge der Tonhöhen enthält als Code die Rufnummer. Das anschließende Zwitschern ist dann das digitale Gesprächssignal. Hinweise und Ideen: Sehr schön können die Schülerinnen und Schüler im Selbstversuch die Übertragung digitaler Daten im Tonfrequenzbereich bei einem klassischen analogen Modem mit Mithörlautsprecher studieren. Macht man z. B. bei T-Online den Verbindungstest, wird - parallel zum hörbaren Ton - am Bildschirm auch noch in einem Textprotokoll angezeigt, was gerade passiert bzw. übertragen wird!

Experiment

Siemens Stiftung

Determining the efficiency of a hand-held mixer (teacher information)

Teacher information:
Teaching methods for teachers on the experiments of the experimentation instructions of the same name.

This teaching method provides all information that teachers need to prepare and conduct the experiments. It lists all materials. In addition, it gives safety information and tips for conducting the experiments.

Information and ideas:
Observe the safety information in the instructions as well as the applicable safety guidelines for your school.

Anderer Ressourcentyp

Siemens Stiftung

B6 Renewable energies (answer sheet)

Answer sheet:
For the student experimentation instructions of the same name.


The answer sheet contains sample answers to all questions asked in the student experimentation instructions. In some cases, the answers are very short, often only in the form of key words. Depending on the learning objective, they can be augmented and enlarged upon with additional material from textbooks or Internet research.
Likewise, the answer sheet will be elaborate on the analyses for the individual subexperiments, but only in cases where experience shows that there could be difficulties.

You will find more detailed information in the related experimentation instructions for Experimento | 10+ "B6 Renewable energies (student instructions)", which are available on the media portal of the Siemens Stiftung.

Anderer Ressourcentyp

Siemens Stiftung

B6 Renewable energies (link list)

Link list:
Further information on the experiment "B6 Renewable energies - Sun, water, wind, hydrogen, and fuel cell".

The links can be used for preparing or for further study of experiments from Experimento | 10+.

Experiment

Siemens Stiftung

B5 We build a thermal solar plant (teacher instructions)

Experimentation instructions for Experimento | 10+:
Background information on the content and practical information on conducting the experiment We build a thermal solar plant - With a magnifying glass and mirror. This experiment comprises two subexperiments.


The two subexperiments on concentrating sunlight with a lens and a mirror are particularly suitable in physics class for the students to become acquainted with some laws of ray optics and thermo-dynamics based on a highly topical subject or to verify material already learned. But the experiments can also be used for a project day on renewable energy or energy transition. The materials and apparatus supplied are sufficient to allow four groups of students to work simultaneously.

The experiment comprises two subexperiments:
· Setting fire to a strip of paper using a magnifying glass as a burning lens
· We heat water with the sun

Notes:
· Observe the safety information in the instructions as well as the applicable safety guidelines for your school.
· All materials mentioned in the instructions will have to be purchased directly from commercial sources.

Anderer Ressourcentyp

Siemens Stiftung

B3 How does waste separation work? (answer sheet)

Answer sheet:
For the student experimentation instructions of the same name.

The answer sheet contains sample answers to all questions asked in the student experimentation instructions. In some cases, the answers are very short, often only in the form of key words. Depending on the learning objective, they can be augmented and enlarged upon with additional material from textbooks or Internet research.
Likewise, the answer sheet will be elaborate on the analyses for the individual subexperiments, but only in cases where experience shows that there could be difficulties.

You will find more detailed information in the related experimentation instructions "B3 How does waste separation work? (student instructions)", which are available on the media portal of the Siemens Stiftung.

Experiment

Siemens Stiftung

B2 Greenhouse effect in a drinking cup (student instructions)

Experimentation instructions for Experimento | 10+:
Detailed instructions and questions for students on conducting the experiment "Greenhouse effect in a drinking cup - A model for illustrating climate change". This experiment comprises four subexperiments.


The experiment comprises four subexperiments:
· What influence does it have on the temperature if the cup is closed? - Measurements in an open cup
· What influence does it have on the temperature if the cup is closed? - Measurements in a closed cup
· What influence does the color of the absorber have? - Measurements in a closed cup with a black absorber
· What influence does the color of the absorber have? - Measurements in a closed cup with an aluminum foil absorber

For each subexperiment, the students are first provided with an overview of the materials to be used and safety information. This overview is followed by the detailed, step-by-step instructions for conducting the experiment. Afterwards, the students are asked to note their observations. Specific questions are used to guide the students as they analyze the results of the experiments. At the end, the students are asked probing questions related to the experiment (an answer sheet is available for teachers).

Notes:
· Observe the safety information in the instructions as well as the applicable safety guidelines for your school and discuss it with your students.
· This student instruction is also available in Word format (doc-file).

Anderer Ressourcentyp

Siemens Stiftung

B1 Water cycle (student instructions)

Experimentation instructions for Experimento | 10+:
Detailed instructions and questions for students on conducting the experiment "Water cycle - Evaporation from plant leaves".


For the experiment, the students are first provided with an overview of the materials to be used and safety information. This overview is followed by the detailed, step-by-step instructions for conducting the experiment. Afterwards, the students are asked to note their observations. Specific questions are used to guide the students as they analyze the results of the experiments. At the end, the students are asked probing questions related to the experiment (an answer sheet is available for teachers).

Notes:
· Observe the safety information in the instructions as well as the applicable safety guidelines for your school and discuss it with your students.
· This student instruction is also available in Word format (doc-file).

Anderer Ressourcentyp

Siemens Stiftung

B1 Water cycle (answer sheet)

Answer sheet:
For the student experimentation instructions of the same name.

The answer sheet contains sample answers to all questions asked in the student experimentation instructions. In some cases, the answers are very short, often only in the form of key words. Depending on the learning objective, they can be augmented and enlarged upon with additional material from textbooks or Internet research.
Likewise, the answer sheet will be elaborate on the analyses for the individual subexperiments, but only in cases where experience shows that there could be difficulties.

You will find more detailed information in the related experimentation instructions for Experimento | 10+ "B1 Water cycle (student instructions)", which are available on the media portal of the Siemens Stiftung.