Schriftgröße:
normal gross extragross
Farbkontrast:
hell dunkel

Merlin - Medienressourcen für Lernen in Niedersachsen

 

Ergebnisse 1 bis 9 von 9

 
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    Tense charts

    Material InfoVorschau

    These visual explanations of each English tense provide visual clues for all major tenses of English. Each tense has a dedicated visual clue card with an explanatory sentence. These tense charts help learners use visual intelligence to understand key tense concepts. Basic tense usage and sentence construction is provided following each visual tense chart - (Source: esl.about.com)

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    USA.gov

    Material InfoVorschau

    Informationsplattform der US-Regierung (2009)

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    netzdurchblick.de

    Material InfoVorschau

    An Jugendliche im Alter von zwlf bis 16 Jahren richtet sich diese Website, die im Auftrag der Medienanstalt Hamburg/Schleswig-Holstein von Studierenden der Hochschule fr Angewandte Wissenschaften (HAW) Hamburg entwickelt worden ist. Themenauswahl: Schutz des eigenen Computers, Web-Usability, Internet-Gesetze, Verhalten in Social Communities, Einsatz von Tools.

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    Going-to Future

    Material InfoVorschau

    Usage

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    Blum & Blmchen - Ein Topf-Leben

    Mediendownload InfoVorschau

    Pflanzen sind Lebewesen: So nimmt jede Pflanze, sei es ein Baum oder eine Topfpflanze, unter anderem Nahrung und Energie auf, sie hat einen Stoffwechsel, reagiert auf Umweltreize, wchst und vermehrt sich. Pflanzen bewegen sich sogar, wenn auch in engen Grenzen. Die Sendung behandelt in 3 Teilen: Pflanzen leben, Usambaraveilchen und fleischfressende Pflanzen.

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    The Ear, Hearing and Hearing Impairment - Differentiated frequency ranges in the cochlea

    Material InfoVorschau

    Labeled graphic:Position of the receptors for tones of varying frequencies in the spiral canal of the human cochlea. Frequencies between 16 hertz (hertz = vibrations per second, abbr.: Hz) and 20,000 Hz can be heard by the human ear. To differentiate these frequencies, the receptors for high tones are at the beginning of the canal, those for the low tones at the apex of the cochlea. Information and ideas:The illustration is suitable for explaining or revising fundamentals of Physics like sound, frequency and vibrations.Usable in a worksheet, for work together on the digital projector, or as an overhead transparency.Further information regarding this graphic is available on the media portal of the Siemens Stiftung.Relevant for teaching:The human bodyStructure and function of a sense organPerception of soundHuman hearing ability Communication and understanding

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      Dokument
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    Conservation of energy and efficiency: Heat engines - Design of a thermal power plant

    Material InfoVorschau

    Schematic diagram: A thermal power plant delivers useful energy (electrical energy) from the conversion of thermal energy. The individual conversions steps are shown here schematically. Thermal power plants use different primary energy sources in order to convert the energy stored in them into heat and finally into electrical energy and thus make them usable for humans. The heat is generated by burning fossil fuels or biomass, through geothermal energy, solar heat or nuclear fission. The heat is transferred to a working medium (steam, combustion gas) that drives a turbine. This converts the thermal energy of the working medium into rotational energy and drives a generator via a common shaft. This in turn converts the rotational energy of the shaft into electrical energy. The heat which is not used during energy conversion is dissipated (cooling unit) or used for heating purposes (district heating). The different pillar thicknesses before and after the turbine illustrate that heat cannot be converted 100% into mechanical work.Information and ideas:The designation thermal power plant" is derived from the form of energy (thermal energy) that is used for conversion into useful energy. Students learn that a nuclear power plant is also a thermal power plant. Why are combustion engines not used as energy converters in large thermal power plants whereas they are in block-unit heating power plants? How does the efficiency of thermal power plants differ between those with steam turbine and those with gas turbine?

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    Wave power plant

    Material InfoVorschau

    Labeled graphic:Cross-sectional view of a wave power plant with a Wells turbine. A wave power plant converts the kinetic energy of the ocean waves to electric energy. A wave power plant operates, for example, according to the principle of an oscillating water column. A funnel-shaped roof covers the surface of the water. Inside, the waves rise and fall, compressing and decompressing the trapped air. The energy stored in the pressure difference is converted to electric power by a Wells turbine and generator. The special feature of a Wells turbine is that, once in motion, it maintains the same direction of rotation, no matter the direction from which the water is flowing. This is due to its completely symmetrical blade profile.A pilot wave power plant operated by Voith Hydro Holding GmbH & Co. KG in Scotland supplies as many as 50 households with electric energy. Experts estimate the usable energy potential of wave power to be one Terawatt, which is approximately equal to the power of around 1,400 conventional power plant blocks.Information and ideas:What is the difference between a wave power plant and a conventional hydroelectric plant? How do the turbines used differ in terms of structure and function? What are the physical features that allow a Wells turbine to always turn in the same direction? What parts of the world offer optimum conditions for wave power plants?

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    Use of water by production sectors

    Material InfoVorschau

    Chart: Water usage by production areas that account for the lions share of overall usage. Direct water consumption (water use) by industry and private households in Germany in 2004 was 40.5 billion m, down from 51.2 billion m in 1991. Water use is derived from the users own production and outside procurement, minus the amount transferred to third parties. Macroeconomically, water use differs from water consumption only by the balance of water export and import (water transfers across the borders of Germany).Information and ideas:This shows what industries need how much water.

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