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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.
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.
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.
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.
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.
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.
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.
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.
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.
Das Thema Elektrosmog hält sich seit langer Zeit in den Medien. Der Film erklärt, was es damit auf sich hat, und erläutert, auf welche Weise sich die naturwissenschaftliche Forschung dem Thema annähert. Die damit verbundenen Probleme werden erläutert und die aktuellen Forschungsergebnisse vorgestellt.
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.
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.
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.
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.
Einer der bedeutendsten Wissenschaftler unserer Zeit, Stephen Hawking, stellt sich in dieser Dokumentation den großen philosophischen Fragen zur Existenz. Außerdem befasst er sich mit den Fragen zu Außerirdischen, Zeitreisen, dem Urknall und dem Anfang und Ende der Zeit auf allgemein verständliche Art.
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.
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.
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.
Mass is one of the seven basic physical quantities. This video gives an understandable definition of this quantity, names its unit of measurement and explains how it is related to the force of weight. Colloquially and outside the physical context, mass is also called weight, which can lead to confusion.
This video explains the concept of a magnetic field. It clearly describes some essential effects of magnetism and illustrates the concept of field lines. The film shows what the Earth´s magnetic field is all about, it clarifies geographical and magnetic poles and goes into the phenomenon of declination.
Lorentz force describes the effect of magnetic fields on moving electrons. It acts perpendicularly to the magnet´s field lines and to the direction of the electrons. The film shows how to determine the direction of movement of the electrons using the three-finger rule and where this force is used for technical purposes.
Light travels at very high speed in a vacuum as well as in the air. As soon as it hits a denser material, however, its speed is slowed down. The film explains the refractive index, demonstrates why light rays are deflected in water, for example, and shows what angle is needed for a total reflection.
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.
Levers are simple machines, or more precisely, they are mechanical force converters that magnify the force which is applied. The film explains the law of levers and shows the different forms of levers. Examples of different lever tools are given, such as scissors, tweezers, wheelbarrows, and nutcrackers.
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.
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.