The e.m.f. of the cell used in the main circuit of the potentiomter should be more than the potential diference to be measured. Why?

What type of cell should be used in the main circuit of the potentiometer and why?

The e.m.f of the following galvanic cell:

The e.m.f of a cell is 1.5 V. On conneting a 14Omega resistance across the cel, the terminal potential diference falls to 1.4 V. Calcualte the internal resitsnce of thecell.

Why voltmeter less accurate in measuring potential difference than a potentionmeter?

What is e.m.f. of the cell, when the cell reaction attains equilibrium ?

What is the difference between e.m.f. and potential diffrence?

A cell of e.m.f. 4 V and of negligible internal resistance is connected in series with a potentiometer wire of length 400 cm. The e.m.f. of a Leelanche cell is found to be balacned at 150 cm from the positive end of the potentiometer wire. What is the e.m.f. of the Leclanche cell ?

A number of identical cells, n , each of e.m.f. E, internal resistance r connected in series are charged by a d.c. source of e.m.f. E', using a resitor R Deduce the expresison for the charging current and the potential difference across the combination of the cells.

What do you mean by internal resiatnce, e.m.f. (electromotive force) and terminal potential difference of a cell?