Marktplatz für digitale Bildungsmedien
Der Laser wird im Alltag für viele Aufgaben genutzt: Er liest DVDs und CDs, schneidet Metall, misst Geschwindigkeiten und Entfernungen präzise und wird bei Operationen eingesetzt. Der Film erläutert den Aufbau und die Funktionsweise des Lasers und erklärt, aus welchen Stoffen er gefertigt sein kann.
We take it for granted in everyday life that electricity "flows". This video explains electrical circuits and the movement of electrical load carriers within them. It also looks at conductors and insulators, at the effect of negatively and positively charged materials on one another, and at induction.
In this video, the basic functional principle of the electric motor is explained. Among other things, the structure of the rotor, the stator, and the commutator in the DC motor are clearly illustrated. The film then shows the different uses of permanent magnets and electromagnets in the electric motor.
The electrical component coil works with an interaction of electricity and magnetism. The video shows how electromagnetic induction works, i.e., the generation of electrical voltage on an electrical conductor by a changing magnetic field. The film explains inductance and Lenz´s rule and introduces the many uses of coils.
The subject of this film is the simple CCR circuit. It is explained using the example of a radio with an external loudspeaker. The first C stands for the coil, the second for the capacitor, and the R for the resistor. The film explains how the coil and capacitor can be used as filters for high and low frequencies.
Electricity flows in an electric circuit. With switches, you can interrupt this flow. The video explains how the various switches such as push-buttons, circuit breakers and sensor switches work. Various examples of the AND- and OR-switch show that an electric circuit can also be interrupted several times.
The topic of this video is capacitors. They are passive components in electrical circuits that can store energy. The film shows how exactly capacitors work and how differently they react to direct and alternating current. There is a whole range of devices in which the versatile little storage devices are used.
This video explains the basics of additive colour perception. Topics covered include additive colour mixing of red, green and blue, spectral colours, the colour wheel and complementary colours. The film also explains how colour perception takes place through the combination of the eye and the brain.
If forces act on a body at different points of application, their effect is different. The film shows which rules are used to determine the resultant of two individual components on the one hand, but also two individual forces from the resultant, a component, or an angle on the other by means of the parallelogram of forces.
Diese Fernsehserie basiert auf Jürgen Thorwalds gleichnamigen Bestseller und zeigt in zehn packenden Episoden, wie im 19. Jahrhundert wichtige Entdeckungen in der Medizin und in der Chirurgie gemacht wurden. Diese Entwicklungen werden im jeweiligen erstaunlichen und manchmal amüsanten Kontext erklärt.
Der Dokumentarfilm betrachtet das Zusammenleben von Menschen und humanoiden Robotern. Er erzählt unter anderem die Geschichten eines US-Amerikaners, der einen Roadtrip durch Kalifornien mit seiner Roboter-Partnerin unternimmt, und einer alten Dame, die in Tokio von ihrem Sohn einen Roboter geschenkt bekommt.
Bei den alternativen Antrieben für Autos haben Batterien aktuell die Nase vorn: Tesla-CEO Elon Musk etwa glaubt nicht an Brennstoffzellen. Der Film erklärt die Nachteile der Zellen, zeigt aber auch auf, woran es bei den Batterien hapert und weshalb sich die Brennstoffzellen doch noch durchsetzen könnten.
If we perceive something as heavy, this is due to the high mass of the object with its comparatively low volume. The density of an object is defined as the ratio of its mass to its volume. The film uses a number of everyday examples to show how the mass of substances can vary greatly for the same volume.
Columbine, Erfurt, Emsdetten: Die Anzahl so genannter Schulamokläufe ist in den letzten Jahren dramatisch gestiegen. Marita Neher zeichnet im Film ein differenziertes Bild jugendlicher Amokläufer, zeigt Präventionsversuche und fragt nach neuesten wissenschaftlichen Erkenntnissen zu den Ursachen.
The subject of this film is electromagnetic induction. A conductor loop suspended in a magnetic field illustrates how mechanical energy can be converted into electrical energy. A brief history of electromagnetic induction is given, the AC and DC voltages are explained and areas of application in industry are shown.
If the curvature of a curved mirror is convex, it distorts the mirror image. If it is concave, this is also true, except that the image is also upside down. The film explains why this is so and how the laws of reflection explain it. In addition, the video shows possible applications for everyday life.
Electrical engineers often use transformers. They can easily turn a low primary voltage into an unequally higher or lower secondary voltage. How this works in detail, for what purposes one needs this transformation in everyday life and what electromagnetic induction is exactly, is explained in the film.
Archimedes originally set out the law of the lever. The film shows how it has been developed since then and how it leads directly to the law of rotation. The law is explained and its practical uses demonstrated, for instance the wheel and axle which is used in ship´s rudders and many times in bicycles.
The physical term work is defined as the force exerted on a body in a certain way. In physics, a distinction is made between the work of lifting, acceleration, deformation, tension and friction, as the video explains with the help of examples from everyday life. The unit used to measure work is the joule.
This video shows how the state of motion, gravity and magnetic attraction of objects changes when different physical forces act on them. The film shows that the effects of these forces are measured in Newtons and that they are vector quantities. The law of interaction is also explained with examples.
For a temperature measurement procedure to be exact, it has to be reliable and repeatable. This films looks at different temperature measuring devices, namely the thermometer, the bimetallic thermometer, and the resistance thermometer, which depend on changeable substance properties at different temperatures.
With the colours blue, yellow and purple, all colours can be produced. This is due to subtractive colour mixing: the colours act like a filter that prevents you from still seeing the original colours. The video explains understandable how the absorption spectrum of the filter makes some colours visible.
In addition to conductors and non-conductors, there are also so-called semiconductors with regard to electrical conductivity. Using the example of silicon, the film explains how a substance can change from a non-conductor to a conductor under certain conditions. It mentions the many possible uses of semiconductors.
The invention of the diode was soon followed by the development of another electrode - the triode. This was the first amplifier. These amplifiers were used extensively until the transistor almost completely replaced them. As the video shows, electron tubes are now only used in high-end guitar amplifiers.
No other component is used as frequently in electronic devices as the transistor. This video tells the story of the component: how it was invented, how it revolutionized and drove technology, how exactly it works and what uses have been found for it over time - especially since the beginning of the digital age.
This film presents four common semiconductors that we use frequently in everyday life. It explains the structure and functioning of the thyristor, the triac, the photo-semiconductor, and the LED and shows examples of where they are used - such as washing machines, elevators, light switches and headlights.
The first semiconductors were discovered in passing when people wanted to make the light bulb more economical. Since then, a lot has changed about them. The film retraces this development and explains not only how the diode works, but also some important technical terms and the use of semiconductor diodes.
For a surface to reflect light, it must be very smooth. A regular reflection is given, for example, by processed glass and metal, which are used to make mirrors. The film explains the law of reflection, the creation of illusions through partial reflection, and that the mirror image is a result of our own perception.
Power is a measure of the speed of work, and the watt is the unit in which energy consumption is measured. The film gives the definition of watt. You can compare mechanical, thermal and electrical power and easily convert them into each other. This video explains why and how this conversion is possible.
Electricity flowing through a wire generates a magnetic field. If this wire is twisted into a coil, the magnetic fields of the individual turns merge into a single stronger field. An iron core in the middle can intensify this effect. With this description, the video explains the construction of an electromagnet.