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Food production - "energy hog?

Interactive graphic:
Production stages for a food until it is eaten, with the energy consumption and energy-saving potential for each stage.

An industrially produced foodstuff generally has to travel a long way before it lands on our plate. This is illustrated graphically using an example of a food (chicken wings). At each step, the graphic shows what energy is needed for and what measures could be taken to save energy. Synthetic amino acids are named as one energy-saving possibility. All essential amino acids (for example, methionine) can be produced synthetically today and would save up to 95 percent of the energy if used in feed, compared, for example, with growing soy beans. In addition, the use of freshwater and pollution with fertilizers and pesticides would be reduced. Further potential for saving energy can be discussed.

Information and ideas:
Because this media file shows energy consumption in the context of food production and consumption, monitoring one?s own consumption would be appropriate. Students should think of meals for one day that use as little energy as possible for production, transportation, consumption, and waste disposal. The thoughts can range from mostly unprocessed products to completely synthetic products.
The "Meat and sustainability? animated film is suitable to get the students thinking.


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Energy Saving: Energy saving as an energy source

Schematic diagram:
On the basis of selected examples, this overview demonstrates that energy saving itself can be described as an "energy source.?

Five examples from everyday life (electric power and heat generation, power distribution, construction, lighting, and transportation) are used to show how energy saving reduces the consumption of individual energy sources (primary or secondary).

Information and ideas:
Students can look for further examples. What is the significance of energy saving in relation to the general scarcity of resources? Can it be equated roughly with the harnessing of renewable energy sources?


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Energy consumption of household appliances

Chart:
The chart shows the electric power consumption and, in some cases, the water consumption of certain household appliances. The average consumption figures of appliances from 2009 and 2015 are compared.

The chart shows a comparison of the electric power consumption of dishwashers, washing maschines, fridge-freezers, and tumble dryers. The values for 2015 are based on appliances with efficiency class A+++. It is clear that a savings potential of 15 to 40 percent still exists. For example, a 2015 washing machine uses 40 percent less electricity and 15 percent less water on average than a 2009 washing machine.

Information and ideas:
Apart from using state-of-the art technology, people can also save energy when washing dishes, washing and drying clothes, and cooking through energy-aware behavior. What options are there?


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Communication costs energy

Interactive graphic:
Overview of the annual energy requirement of communication with a smartphone

In modern communications, as with every form of communication, a message is sent from a transmitter via a channel to a receiver. A smartphone is used daily, to communicate, navigate via GPS, or call up information from the Web. In this context, the graphic shows devices and transmitters with their annual energy requirement in kilowatt-hours (kWh). Most users have little idea about the amounts of energy (particularly electric power) that are needed for this modern communications technology. Servers, for example, need energy for uninterrupted operation and for the required cooling of equipment.

Information and ideas:
This topic raises questions such as: How much energy is needed worldwide for mobile radio communications? What could this energy otherwise be used for?


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What do private households use energy for?

Chart:
Percentage energy consumption of German and British private households according to different application areas

The bars show what proportions of the energy consumption in private households are used for room heating, hot water, cooking, lighting, and for electronic appliances. By way of example, the data for Germany and the United Kingdom from 2012 are compared. In addition, the total energy consumption of all households in Germany and the United Kingdom in 2013 is indicated. In addition, the total energy consumption of all African countries south of the Sahara is indicated.
As can be seen from the chart, a large proportion of the energy in a household is used for heating and hot water. But considerable energy is also used for running refrigerators. Some of this energy could be saved by using it sparingly and and deliberately.

Information and ideas:
If you look at the energy consumption of individual areas in their entirety, you will see that heating energy accounts for the largest share at over 60 percent in both countries. From this it follows that there is enormous energy saving potential particularly when it comes to heating. How can that be implemented? A few examples are:
· the construction of energy-saving buildings by paying attention to the influence of daylight and ensuring adequate insulation
· the purchase of energy-efficient household appliances with energy labels A, A+, and A++.
Compared with the two European countries, the energy consumption in Africa is low. One reason for this is that in many regions, only a few people even have access to an energy supply.

Information and ideas:
What energy-saving measures can students take themselves? Specific energy saving tips can also be found in the "Tips for energy saving in the household? medium.


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Energy saving (mind map)

Mind map:
Different facets of energy saving are visualized.

Starting with the question of why energy saving is necessary, the mind map considers the questions of where, how, and at which societal levels energy can be saved.

Information and ideas:
The mind map is suitable as an introduction to the topic. Individual points can be assigned as presentation topics, such as "What is the government doing to save energy and to promote energy saving??


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Waste of energy

Photo:
Energy is wasted when a home is aired out while the heat is on.

In many homes, energy is wasted every single day, for example, when the heat is turned on while the windows are continuously open to air out the home. Proper behavior in airing out a home saves energy, which reduces the household?s energy costs.

Proper airing out is simple: Turn the heat off, open the windows wide, let fresh air inside, and then close the windows again after about 5 minutes. A brief period of strong cross-ventilation is better than leaving the window cracked open all day.

Information and ideas:
The "What do private households use energy for?? medium is available as additional information. The medium can be used as an image for discussion to introduce the topic of energy saving.


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Means of lighting in comparison

Graphic:
An incandescent lamp, an energy-saving light bulb, and an LED are compared in terms of costs and efficiency.

The comparison as a table shows that although energy-saving light bulbs and LEDs are more expensive to purchase, their total costs are significantly lower over a period of 10,000 hours. In addition, they are much more efficient than an incandescent lamp.


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Perforation of the eardrum

Labeled graphic:
Simplified illustration of a perforated eardrum.

A perforated eardrum can occur when foreign bodies, for example, instruments to clean the ears, are stuck in too far or when there are loud bangs near the ear.
Violent blows to the ear can also cause perforation.

Minor tears or perforations can heal up by themselves provided they get the proper treatment. In any case, a doctor should always be consulted!

Information and ideas:
Can be used for illustration purposes on the subject of "Ear diseases" either on transparencies or worksheets. Supposedly "harmless" minor problems can turn into serious damage to the ear.

Relevant for teaching:
Hearing defect/hearing impairment

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Phase diagram of water

Diagram:
A P-T diagram for pure water. The lines indicate the temperature and the pressure at which the solid, liquid, and vapor phases exist in equilibrium. All three phases exist in equilibrium only at the triple point; otherwise, there are a maximum of two phases.

In addition to the equilibrium curves (melting pressure curve, sublimation curve, vapor pressure curve), the diagram also includes the pressure and temperature data for the melting, boiling, triple, and critical points.
Attention: The axes of the diagram are not shown true to scale.

Information and ideas:
This diagram also reflects the density anomaly of water (lower density in the solid state than in the liquid state): The melting pressure curve shows a negative slope. The reason for the density anomaly is the hydrogen bonds.