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Siemens Stiftung

Redox flow cell

Schematic diagram:
The redox flow cell is an accumulator and works, so to speak, with liquid electrode materials, e.g., with zinc (Zn) and bromine (Br).

The graphic shows the flow of the electrode material during discharging of the cell. Two graphite electrodes (black surfaces) collect the current. Zinc is oxidized at its electrode, while the bromine is reduced at its electrode.
During charging, voltage is applied and the two solutions are pumped past the electrodes again.

Information and ideas:
What advantages does this process have over conventional galvanic cells?

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Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Police car

Photo:
Police car as typical road user.

Information and ideas:
Use picture to start discussion or for illustration purposes.

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Siemens Stiftung

Noise and concentration - for example music

Photo:
You can do homework more quickly with music on? Tests show this only applies to routine tasks. Otherwise music is more like disturbing noise.

Is music relaxing pleasure or a disturbing noise? This is a very subjective matter. Objectively the answer depends on the specific situation!

Information and ideas:
This question "Music on when doing homework?" is an evergreen. Maybe an objective answer can be reached using the criteria of concentration and effectiveness?

Relevant for teaching:
Hearing defects/hearing impairment
How hearing works
Damage to the sense organs
Noise
Personal health care

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Siemens Stiftung

Lens and imaging equation

Schematic diagram:
The light rays emanating from the object must be collected through a lens to form the points of an image. The imaging equation describes the applicable laws.

At least two of the following rays are needed to construct the image:
· Ray from the object parallel to the optical axis (parallel ray)
· Ray from the object through the focal point of the lens (focal ray)
· Ray from the object through the central point of the lens (central point ray).

The central point ray passes through the lens without changing direction. The parallel ray passes through the focal point on the other side of the lens, and the focal ray becomes the parallel ray.

Note: The imaging equation is also frequently known as the "lens equation."

Information and ideas:
What are lenses needed for?

Medientypen

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Lernalter

13-18

Schlüsselwörter

Light Optics

Sprachen

Englisch

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Siemens Stiftung

Inner ear section

Labeled graphic:
Section view with the most important parts of the inner ear. The most important parts are highlighted in color.

Both the sense of balance and the sense of hearing are situated in the inner ear.
The inner ear is formed by a complicated system of cavities. This system is called the bony labyrinth.
Distinction is made between the cochlea, the semi-circular canals and, in between, the vestibule. In the cochlea there are two openings each covered with a taut membrane. These are named after their shape, i.e. round window and oval window. The oval window is a sort of entrance for sound and the round window a sort of exit.

Information and ideas:
Helps to put the inner ear in the overall context of the structure of the ear.
Can be used, for example in a worksheet, for work together in class with the digital projector, as overhead transparency.

Relevant for teaching:
Structure and function of a sensory organ
Reception of stimuli and transmission of information
Functions of senses

Medientypen

Bild

Lernalter

11-18

Schlüsselwörter

Anatomy (human) Ear

Sprachen

Englisch

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Siemens Stiftung

Incandescent lamp

Photo:
The light in this incandescent lamp is generated by heating a filament to high temperatures.


In many light sources, for example, incandescent lamps or high-pressure gas-discharge lamps, a continuous light spectrum is generated by the interaction of large numbers of photons at very different energy levels. This means that the complete range of wavelengths is included, but in different proportions depending on the temperature.
Incidentally, the wavelength and energy distribution of incandescent lamps fit the Planck radiation formula extremely well.

Information and ideas:
Example of how physical laws are translated into technical applications. Double-coiled filaments are used, among other reasons, to increase the radiant surface.

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Siemens Stiftung

Frequency differentiation in the uncurled cochlea

Labeled graphic:
High-pitched tones are heard in the front part of the cochlea, low tones are heard in the back part.

As the sense of hearing is able to differentiate locations of the nerves, it is able to recognize the frequencies.

Information and ideas:
This graphic is good for creating a link between the topics of "Sound? and "Hearing?.
Further information regarding this graphic is available as information sheet on the media portal of the Siemens Stiftung.

Relevant for teaching:
Perception of sound
Human hearing ability
Communication and understanding
The human body
Structure and functions of a sensory organ

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Siemens Stiftung

Excitation energy of a water molecule

Chart:
Water can absorb heat energy in the form of vibrations or movement of its molecules. This energy content depends on the physical state: steam contains more energy than liquid water, for example.

The material surrounding us takes on different physical states depending on pressure and temperature (in Kelvin): solid, liquid or gaseous. This also applies to water: During a phase change from solid to liquid and liquid to gas respectively the energy of the water molecules increases without the temperature rising - the diagram for water shows plateaus. The values of these plateaus are approx. 6 kJ/mol (melting heat) and approx. 40,7 kJ/mol (vaporization heat) respectively.

Information and ideas:
Ideally suited for explaining the topic of phase equilibrium.

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Siemens Stiftung

Entire ear section (b/w)

Unlabeled graphic:
Simple black and white cross-section of ear. For worksheets, printouts etc.

With the help of this graphic the most important functional areas of the ear and their significance in the hearing process can be explained.

Information and ideas:
The teacher can label the graphic together with the students on the computer screen or get the students to label it themselves either on a printout or at the computer screen.

Relevant for teaching:
The human body
Structure and function of a sensory organ

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Siemens Stiftung

Cotton wool buds

Photo:
Cotton wool buds.

Attention when cleaning ears: Cotton wool buds must not be pushed too far into the ear canal as this can injure the eardrum.

Information and ideas:
Use picture to start discussion on the topic of "Health care" and specifically "How to take care of ears".

Relevant for teaching:
Personal health care