Why are certain procedures necessary in a potentiometer experiment?

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In a potentiometer experiment, connecting the positive pole of the battery to the same terminal as the driver cell ensures accurate measurement of electromotive force (emf). Removing the protective resistor before determining the final balanced point is necessary to avoid interference with the readings. A rheostat is included to adjust current flow, but its resistance must remain low to prevent affecting the circuit's balance. A standard cell is essential for calibrating an ammeter, but not for measuring a cell's internal resistance, as the latter requires direct comparison. When comparing resistors A and B, placing them in series allows for a straightforward measurement of their resistance values.
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can someone please explain to me...?

explain the reasons for the following procedures in potentiometer experiment:
(a)the positive pole of a battery whose emf is required is connected to the same terminal of the potentiometer wire as the positive pole of the driver cell.
(b)The protective resister is removed before a final balanced point is determined.
(c)A rheostat is sometimes included in the potentiometer circuit with the driver cell but its resistance must not be too high.
(d)A standard cell is needed in an experiment to calibrate an ammeter but not in an experiment to measure the internal resistance of a cell.
(e)In comparing the resistance of two resistors A and B, the resistors are placed in series in a circuit.
 
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You need specific circuit diagram to augment these somewhat unclear problem statements
 

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