Educational DVD tracing the development of primary cells from the Daniell cell to zinc-carbon dry cells, alkaline cells, button cells and lithium metal cells. The essentials of their chemistry and construction are outlined, as well as the advantages and limitations of each format. The program also reviews the concepts of power, voltage and current, as well as the difference between a cell and a battery, and between cells in series and parallel. For senior high school and tertiary students. Duration: 22 minutes. Available from reesfilms.com
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