Boosting battery performance (without subtitles)
Video (04:33 minutes, without sound):
The experiment with the Cu/Zn element shows that a battery reaches its full capacity only when Cu2+ ions are present.
The film is also available on the media portal as a version in which explanations are displayed as subtitles for some scenes: “Boosting battery performance (with subtitles)."
Information and ideas:
The experimentation instructions for “A3 Lemon batteries and other batteries" contain two subexperiments (4 and 5) that involve copper sulfate. For safety reasons, however, some teachers may not want to allow any experiments involving copper sulfate in their classrooms. In this case, the teachers can show this video with subexperiment 4 as an alternative. This allows the overall experiment consisting of subexperiments set up as many didactic steps to be completed systematically anyway.
The teacher should point out to the students that the simplified experiment shown in the film works without a separator. Detailed experimentation instructions are found in the medium “A3 Lemon batteries and other batteries (student instructions)" for subexperiment 4, which is available on the media portal. The technical explanation is found in the medium “A3 Lemon batteries and other batteries (teacher instructions)."