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WEEK 4
ELECTRIC CIRCUIT
Electric current is simply electric charge in motion. Electric cells are chemical devices, which are capable of causing an electric current to flow. This produces electric force, which pushes the current along.
Electrons flow from the negative terminal or cathode of the cell to the positive terminal or anode
TYPES OF ELECTRIC CELLS
Electric cells are divided into two namely: the primary cells and the secondary cells
PRIMARY CELLS – These are those cells in which current is produced as a result of an irreversible chemical charge.
SECONDARY CELLS – These cells are those which can be recharged when they run down by passing current backwards through them.
There are three components in a cell. Viz:
THE SIMPLE PRIMARY CELL (VOLTAIC CELL)
A simple cell can be made by placing two different electrodes (metals) in an electrolyte. Two wires are then used to connect these metals to a voltmeter. If a deflection is noticed it means that the cell creates a voltage.
Defects of a simple cell
The two major deflects of a simple all are polarization and local action
This defect can be corrected either by occasionally brushing the plates, which is highly inconvenient, or by using a depolarizer e.g. manganese oxide.
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