Suchergebnis für: ** Zeige Treffer 1 - 10 von 101

Experiment

Siemens Stiftung

7. Electronics - 7.2 Capacitors (student instructions)

Experimentation instructions:Detailed instructions and questions for students on conducting the experiment "Capacitors”.The questions "What are the properties of a capacitor?” shall be answered by experimenting.Information and ideas:One item deals with "Technical application and vocational orientation".

Experiment

Siemens Stiftung

Determining the efficiency of a hand-held mixer (teacher information)

Teacher information:
Teaching methods for teachers on the experiments of the experimentation instructions of the same name.

This teaching method provides all information that teachers need to prepare and conduct the experiments. It lists all materials. In addition, it gives safety information and tips for conducting the experiments.

Information and ideas:
Observe the safety information in the instructions as well as the applicable safety guidelines for your school.

Simulation

Siemens Stiftung

Energy skate park

Simulation:The conversion of potential energy to kinetic energy and thermal energy is visualized by means of a skateboarder riding on a track. Parameters like mass and friction can be changed. The constant interconversion between potential energy and kinetic energy is made visible in bar graphs and pie charts. On the "introduction” screen, friction is left out. On the "friction” screen, conversion to thermal energy due to friction is added. Besides a parabola-shaped track, two other tracks can be selected. In a further stage, the students can build their own track for the skateboarder to ride on. Ramps, jumps, and even loops are possible.Information and ideas:The "Energy skate park (teacher information)” teaching methods are available for teachers on the media portal of the Siemens Stiftung.

Anderer Ressourcentyp

Siemens Stiftung

Energy conversion processes in everyday life

Information sheet:Examples illustrate that energy conversion processes take place in everything that happens. We’re just not always aware of them. Energy conversion processes that occur every day are addressed in examples ranging from sunbathing to nuclear fusion. Information and ideas:Depending on the students’ level of knowledge, individual examples can be excluded. Can the students find their own examples of energy conversion processes?

Anderer Ressourcentyp

Siemens Stiftung

How long will our energy sources last? (ES)

Chart:A bar chart shows an overview of the remaining years of use of energy sources. Of the fossil energy sources, oil will be the first to run out. What is the situation for the other fossil energy sources? And is it really true that renewable energy sources will never run out?As a comparison, the average lifespan of a person is shown below the bar chart.


Anderer Ressourcentyp

Siemens Stiftung

Renewable energy sources and technologies (ES)

Overview graphic: Illustration of the renewable energy sources sun, wind, and water, each with an example of a power plant solution Renewable energies are inexhaustible by human standards since they renew themselves. They present an alternative to fossil energy sources due to their significantly lower carbon dioxide emissions. Each renewable energy source is shown combined with a specific use in power plants: sun as the energy source and a solar thermal power plant, wind as the energy source and a wind turbine, and water as the energy source and a run-of-river power plant.Information and ideas:The graphic provides the students with an overview of renewable energy sources. At the same time, a connection is established to the technologies for electric power and heat generation. The graphic can be used as an introduction to the topic of renewable energies and simultaneously as a starting point for a discussion on energy sources, energy converters, and the environment and ecology.


Anderer Ressourcentyp

Siemens Stiftung

Power plant waste and emissions

Table:Power plant waste and emissions broken down by energy sources. The table applies only to the power plant itself. Preceding processes must be considered separately. The basic types of potential pollution are listed regardless of the extent to which they are compensated for through technical countermeasures. The dots indicate the pollution. The number of dots signifies the comparative pollution of the energy sources so that within a row, the energy sources can be weighted by type of pollution. Dots in parentheses indicate differences for plants with very different designs. Not all emissions are waste. Desulphurization results in gypsum as a commodity. Ash and slag can also be used.Information and ideas:Detailed information on the topic can be found in the "Waste and emissions” information sheet, which highlights, for example, the technical countermeasures to compensate for possible pollution.


Dieses Material ist Teil einer Sammlung

Primärmaterial/Quelle

Siemens Stiftung

Vocational Orientation - What can you expect from becoming an electrician?

Web resource: Vocational orientation course for future electricians.Students can expect from this course:an overview of the job itself,personal insight from electricians working in leading African companies and their employers,some key insights in relevant competencies like creative problem-solving,training the relevant knowledge about science, technology, engineering, and mathematics (STEM) with interactive elements. You will learn about:• sources of energy• electrical circuits• saving energy• renewable energy

Anderer Ressourcentyp

Siemens Stiftung

Facts about solar energy

%verview graphic:Schematic representation of the flow of energy from the sun to the earth: How much energy does the sun produce and how much of this reaches the surface of the earth?The sun is the main supplier of energy to the earth, providing about 99.98% of the total energy contribution to the earth's climate. The vast potential offered by the technical use of solar energy as a source of energy is shown clearly by the fact that the current world energy consumption is only 0.006% of the solar energy received. The diagram provides an overview of the quantities of energy given off by the sun and arriving on the earth. It should be noted that 100% of the energy radiated by the sun is ultimately given off again by the earth back into space. The energy balance of the earth is equal at all levels from the surface of the earth into outer space. But watch out: A tiny fragment of the radiated energy is stored by photosynthesis (approx. 0.1%) or by human activities (approx. 0.005%) and remains on the earth for a longer period of time.Information and ideas:To make the illustration clearer, the size ratios of the sun and the earth are not shown to scale. It is taken into account that ultimately 100% of the radiated energy is reflected back into outer space%

Anderer Ressourcentyp

Siemens Stiftung

Radiant energy

Chart:Formulae for the radiant energy of electromagnetic waves and Planck's law of radiation.Radiant energy is the energy of electromagnetic waves. It is proportional to the square of the amplitude of the electrical or magnetic field strength. Electromagnetic waves of high frequency and therefore high energy have the character of particles. The energy of these particles is proportional to the frequency and inversely proportional to their wavelength. The proportionality factor is Planck’s quantum of action h. Max Planck discovered in his investigation of radiation from black bodies that radiation energy must be composed of discrete quanta. He formulated a law of radiation which could not, however, be explained until Einstein postulated light quanta. Numerical example of Planck’s radiation formula:The sun has a surface temperature of 5,800 K; the associated radiant power according to Planck’s radiation formula is 3.85 x 1023 kW. Only a very small proportion of this strikes the earth (with vertical radiation incidence 1.37 kW/m²).Information and ideas:Radiant energy can be converted into other energy forms. In the case of an X-ray radiograph the radiant energy is converted into chemical energy (blackening of the photo film), light is converted into electrical energy in a solar cell, and similarly radio waves in an antenna. The energy of microwaves can be used for heating food.