The Potentiometer and the Internal Resistance of a Battery

The Potentiometer and the Internal Resistance of a Battery...

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The Potentiometer and the Internal Resistance of a Battery March 13 th , 2007 Pre-Questions: 1. The measurement is accurate because a potential difference is known for a battery and the manipulation of the amount of work on electrochemical cell. 2. The potential difference of the source must be equal or higher than the standard cell because the difference we are looking for is where they are both equal, and if it was lower, no data could be collected. 3. It is optimal for the values to be of the same denomination because they are proportional. 4. -When no current is flowing, V = -When current is flowing, V = - IR internal Purpose: To measure the unknown potential differences and internal resistances for a standard cell and various electrochemical cells (combinations of zinc, copper and lead). Method: The procedure was followed (24.3-24.5). Diagrams: Data: Standard Cell emf ( s ) = 1.0136V

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L s (m) L x (m) Cell 0.861 0.220 Standard Battery 0.825 0.175 Copper(+) – Zinc 0.421 0.579 Copper(+) – Lead 0.425 0.575 Zinc(+) – Lead [Copper(+) – Zinc] Cell: Potential Difference: 0.22V (analog)
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