1. What element is described in the text? An electric cell supplies electric energy provided its electrodes are of different materials.
2.In what case does a cell supply energy? In case the electrodes are of the same material they become charged but there is no difference of potential across the terminals.
3.What materials are commonly used for producing negativeelectrodes? Iron and zinc plates are commonly used for producing negative electrodes since these materials produce a high charge.
4.Explain why iron and zinc are used. Carbon is commonly used to produce positive electrodes.
5.What is the voltage output of cells in use nowadays? The voltage output of cells in use nowadays is from 1 to 2 V.
6.What does the value of the output depend on? The value of the output depends only on the materials used for the electrodes.
7.What is the relation between the size of the electrodesandthecurrent capacity? The larger the size of the electrodes the more current capacity they can supply.
8.Give the title to the text. The electrodes