SS3 Second Term Physics Lesson Note – Battery

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WEEK FOUR

BATTERY

• Battery
• Construction of battery
• Electroplating – electroplate a suitable electrode

TOPIC: ELECTRIC CELLS                     

SUB-TOPIC-: ELECTRIC CIRCUIT

Electric current is simply electric charge in motion. In conductors such as cables or wire, the current consist of swam of moving electron. Electric cells are chemical devices, which are capable of causing an electric current to flow. This produces electric force, which pushes the current along. If there is a complete circuit of conductors by which current can leave from one end to terminal of the cell and travel round to the other terminal, a current will flow. This current will be the at any point round the circuit and of the line is broken, the current is stopped or switched off. The electrons flow from the negative terminal or cathode of the cell to the procedure terminal or anode

SUB-TOPIC-: 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 component in a cell .Two of them are electrodes in the primary cell, the two electrodes are of different metals (graphics is often used) the third item is the container bearing the electrolyte. Examples of electrolyte are strips of aluminum, Carbons (graphite) copper, iron lead and zinc

SUB-TOPIC: THE SIMPLE PRIMARY CELL (VOLTAIC CELL)     A simple cell can be made by placing two different electrodes (metals) in an electrolyte. Two wire are then used to connect these metals to a voltmeter, an instrument which measure the potential different between any two point in an electric circuit. If a deflection is noticed it mean that the cell creates a voltage. If the deflection is done to the right it mean

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