What would be the answer of 3 & 6.

Dear Student

3. Electric cell is a device which converts chemical energy of the chemicals inside the cell into electrical energy.
It contains chemicals such as magnesium dioxide, graphite, electrolytes, zinc oxide which undergo chemical reaction to produce electrical energy.

6. Primary cells are  designed to be used in once only i.e. it is used till its chemical mixtures have power and after that it becomes useless as for ex: dry cells of torch and watch etc.
Secondary cells undergo reversible reactions and thus they can be recharged if once the power is finished. For ex: car batteries etc.


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