Determining the efficiency of a hand-held mixer (students instruction) © Siemens Stiftung 2017

CC BY-SA 4.0 international

Determining the efficiency of a hand-held mixer (students instruction)

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Experimention instructions:
In 1798, Count Rumford discovered during the boring of cannon barrels that mechanical energy can be converted into heat. We’ll try it without the cannon.

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2018-04-25
Freehand experiment with a hand-held mixer that replicates the famous experiment by James Prescott Joule (1843) that proved the equivalence of mechanical work and heat. In honor of Joule’s discovery of this fundamental finding, the unit of energy bears his name.

Information and ideas:
• Observe the safety information in the instructions as well as the applicable safety guidelines for your school and discuss it with your students.
• Mechanical energy can theoretically be converted 100 percent into heat, but the reverse process does not work. Why?
• You will find the answers to the questions contained in the experimention instructions on the answer sheet of the same name on the media portal of the Siemens Stiftung.
Experiment
Chemistry; Physics; Technology
Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Energy; Mechanics; Physics
Siemens Stiftung Media Portal
MediaHouse GmbH MediaHouse GmbH
© Siemens Stiftung 2017

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