Marktplatz für digitale Bildungsmedien
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.
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.
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.
Taking water as an example, the film explains the different states of aggregation of a substance. Below 0 °C, water is solid – it exists as ice. At its melting temperature of 0 °C it takes on liquid form, and at boiling temperature of 100 °C it changes to the gaseous state at normal pressure.
When light rays fall through a small hole in the front wall of an otherwise light-proof box, the image of the object that is in direct line in front of the hole is imaged overhead on the inside back of the box. The film describes step by step how this image is created and how to calculate the image size.
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.
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.
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.
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.
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.
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.
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.
Optical devices influence the course of light rays through lenses. The film shows how lenses are made in the eye and in visual aids such as glasses. The much stronger lenses of magnifying glasses and microscopes are also examined in detail. It is explained how exactly the multiple magnification is achieved.
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.
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.
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.
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.
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.
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.
The topic of this video is the relationship between voltage and amperage. The film introduces the units of measurement volts for electrical voltage, watts for power, joules for energy, and amperes for amperage. It explains why the higher the voltage, the lower the amperage needed for certain outputs.
Immer mehr Menschen schauen auch Frauenfußball. Die Zuschauerzahlen lassen sich allerdings nicht mit denen des Männerfußballs vergleichen. Dafür gibt es keinen reellen Grund, wie dieser Erklärfilm zeigt: Frauen spielen schöner als Männer, was sich anhand verschiedener historischer Spiele belegen lässt.
Barrenturnen lässt sich durch das Experimentieren verändern. Der Film gibt Beispiele für Übungen in der Gruppe oder mit einem Partner, in Kombination mit einem Schwebebalken, mit Bänken oder Kästen. Es sind einzelne Bausteine, die variabel im Sportunterricht eingesetzt und nachgeturnt werden können.
Optical lenses are transparent, light-refracting bodies with at least one curved surface. The video introduces the different forms of lenses and how they work and shows their uses. Important terms such as focal point, refractive power and focal length are explained and the two lens formulas are derived.
The moon does not shine itself, but only reflects the light of the sun. That is why the phases of the moon depend on it. The film shows how the moon changes in our perception depending on the angle it is at to the sun. At an angle of zero degrees it is new moon, at an angle of 180 degrees it is full moon.
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.
The electrical resistance is defined as the quotient of the voltage and the strength of the current flowing in a circuit. At the same time, resistance also refers to a component with which a certain resistance can be realized in an electrical circuit. The film explains both terms using understandable examples.
Für diejenigen, die das Jonglieren mit drei Keulen beherrschen, bietet dieser Film Tipps für das Jonglieren mit vier oder fünf Keulen. Zudem enthält er 30 weitere Tricks für vertikale und diagonale Würfe mit drei Keulen. Es wird gezeigt, wie beim Jonglieren mit einem Partner das Passing funktioniert.
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.
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.
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.