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Anderer Ressourcentyp

Siemens Stiftung

Internal resistance

Information sheet:
Voltage and current sources have resistance themselves, called internal resistance.

The properties of voltage and current sources with respect to their internal resistance are explained and the significance of internal resistance in series and parallel connections of batteries and solar cells is clarified.

Anderer Ressourcentyp

Siemens Stiftung

A5 Properties of solar cells (link list)

Link list:
Further information on the experiment "A5 Properties of solar cells - Voltage, current and power".

The links can be used for preparing or for further study of experiments from Experimento | 10+.

Anderer Ressourcentyp

Siemens Stiftung

Assignments relating to efficiency (answer sheet)

Answer sheet:
For the worksheet of the same name.


Information and ideas:
You will find more detailed information on the corresponding worksheet "Tasks on subject of efficiency," which is available on the media portal of the Siemens Stiftung.

Arbeitsblatt

Siemens Stiftung

Assignments relating to efficiency

Worksheet:
Questions and calculation tasks on the subject of efficiency.


In science and technology, the efficiency of a process or a machine is of enormous importance. It is therefore vital to understand efficiency and to be able to calculate it.

Information and ideas:
Well suited for further study of the topic of "efficiency" and for practicing simple physics calculations.
In addition, students can further research the efficiencies of heat engines, power plants, and other energy sources and compile the results as a table of values.
The answers to the assignments can be found on the answer sheet of the same name on the media portal of the Siemens Stiftung.