Electric cells and batteries
Lesson 9 / 10
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Lesson outcome
I can describe how an electric cell works and how electric cells are combined to produce batteries of different voltages.
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Electric cells contain a store of chemicals that react to produce a voltage across two electrical contacts.
An electric cell made of two different metals in contact with an electrolyte, produces a voltage across the metals.
The size of voltage across an electric cell depends on the materials it is made from.
A battery is made of one or more electric cells, which can be connected in series to produce a larger voltage.
The chemical reaction in a rechargeable battery is reversed when an external voltage is connected across it.
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