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Potentiometer : Internal Resistance of a Cell - MeitY OLabs

This video channel is developed by Amrita University's CREATE http://www.amrita.edu/create ▶ For more Information @ http://amrita.olabs.edu.in/?sub=1&brc... ▶ Amrita Online Lab Project Website http://www.olabs.edu.in/ ▶ Subscribe @    / amritacreate   ▶ Like us @   / createatamrita   Copyright © 2017 Amrita University Developed by Amrita University & CDAC Mumbai. Funded by MeitY (Ministry of Electronics & Information Technology) Potentiometer - Internal Resistance of a Cell :- The electromotive force (emf) of a cell is its terminal voltage when no current is flowing through it. The terminal voltage of a cell is the potential difference between its electrodes. A voltmeter cannot be used to measure the emf of a cell because a voltmeter draws some current from the cell. To measure a cell's emf a potentiometer is used since in a potentiometer measurement no current is flowing. It employs a null method of measuring potential difference, so that when a balance is reached and the reading is being taken, no current is drawn from the source to be measured. This video explains how to measure the internal resistance of a given primary cell using potentiometer.