Topic 5
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Electro-chemical cell
An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions consists of electrodes and electrolytes
Electrodes
Two different metals • one is negative(gives up electrons) • one is positive ( receives electrons) the passing of electrons creates an electrical current
wet cells vs dry cells
wet- liquid electrolyte dry- paste, plastic or ceramic solid electrolyte
electrolyte
a substance that conducts electricity
Primary vs secondary cell
Primary-the amount of chemical it contains determines the energy the cell can produce Secondary-the chemical reaction which produces the electricity can be reversed by forcing electricity through the dead cell -this restores the chemicals so that the cell can continue producing electricity