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 ====== Energy ======
+//Energy is the ability to perform mechanical work, to emit heat or to radiate
+light.//
+Energy is central in our lives: Without heat energy, there is no warm home, no hot shower,
+no hot food. Our mobility also needs energy: when we walk or ride a bicycle, we convert
+chemical energy absorbed by our food into kinetic energy. When we move &quot;by car&quot;,
+chemical energy in the form of petrol or diesel is converted into kinetic energy. And
+industrial production is only possible because machines are supplied with e.g. electrical
+energy.
+The availability of energy is central to our society and our economy. But the use of fossil
+energy releases carbon in the form of carbon dioxide $CO_2$, which was bound millions of years
+ago when coal, oil and natural gas were formed. $CO_2$ is the most important greenhouse gas
+and contributes to global warming along with other greenhouse gases. For example, the
+average temperature measured worldwide has risen by about 1 °C in the last hundred years.
+In order to limit the globally observed temperature increase to 1.5 - 2.0 °C, emissions of
+greenhouse gases, especially $CO_2$, must be drastically reduced. One possibility is to replace
+fossil fuels with renewable energy. However, the availability of renewable energy forms such
+as hydropower, wind energy, solar energy and bioenergy varies considerably. Although wind
+and sun are available almost everywhere, they are subject to the weather and its
+fluctuations, so that their exclusive use is only possible if energy can be stored in times of
+surplus, e.g. as demonstrated here in a pumped storage power plant, in a lithium-ion battery
+or as hydrogen. Energy is a central topic in the Environment and Energy BSc. course at Rhine-
+Waal University of Applied Sciences. For example, how does electricity generation from
+renewable energy or in a coal-fired power plant work? What possibilities are there for
+storing energy and using it effectively?
+===== Our Experiments on Energy =====
+  * [[experiments:photovoltaic_system:start|Photovoltaic System]]
+  * [[experiments:wind_turbine:start|Wind Turbine]]
+  * [[experiments:hydropower_plant:start|Hydropower Plant]]
+  * [[experiments:hydrogen:start|Hydrogen]]
+|{{:experiments:energy:img_20200325_142458.jpg?direct&600|Figure 1}}|{{:experiments:energy:wasserkaftwerk.jpg?direct&600|Figure 2}}|{{:experiments:energy:wasserkraftwerk_mit_geoeffnetem_bypass.jpg?direct&600|Figure 3}}|
+|{{:experiments:energy:p1030743.jpg?direct|Figure 4}}|{{:experiments:energy:p1040585.jpg?direct|Figure 5}}|

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