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Answers:A primary source is an actual witness to the event; a secondary source is someone who tells you what someone else said, or a newspaper article or magazine article
Answers:Primary cell: It is an electrochemical cell which acts as a source of electrical energy without being previously charged up by an electric current from an external source. Secondary cell: The cell in which electrical energy from an external source is first converted to chemical energy and then made to operate in opposite direction by removing the external source. In this cell, the reaction can be reversed practically. It can be recharged after its discharging. More clear cut explanation from the electrochemistry chapter from the following resource.
Answers:primary cell can be used once i.e the reaction in a primary cell is irreversible . example-dry cell. secondary cell is that in which the cell can be used again by recharging i.e the the reaction in a secondary cell is reversible. example-lead-acid battery.
Answers:The main difference is the energy source. In primary active transport, a substance is moved across a cell membrane as a direct result of the cell accessing energy from ATP. In secondary active transport, the energy for the transport is instead derived from a differential in concentrations of a second substance; this differential is usually achieved with primary active transport.