Emf And Internal Resistance Of a Cell

Measuring potential and crucial Resistance of a stall Alice Stockdale tabular array of contents| Background natural philosophy| Pg 2| project| Pg2| Equipment gloaming| Pg2| | | | | | | | | Background Physics: par: emf = V + Ir. The Emf is the total Voltage usable to a cell. The Ir is the inwrought Resistance of a cell. This comparison can be rearranged to give the equation for the Potential remnant (V) across the cell: V = -Ir + Emf This equation can thus be compared with the equation for a straight line: V = -Ir + Emf y = mx + c This displays that the Ir allow for be stand for by the slope of the graphical record and the Y intercept will be the Emf. From these equations the graph judge will have a negative gradient Aim: To cautiously measure the Potential dispute across a electrical impedance and the stream of the circuit. From this the Emf and cozy justification of a cell will be deliberate and calculated.

Equipment Needed: * Resistor * Ammeter * Voltmeter * Cell * railway cable car Range DMM * Multimeter * Datalogger Method: * perplex up equipment as utter: * Take absorbed measures of A and V * Plot results in a graph * Take repeat improved measures Results from experiment 1: In experiment oneness a 0-20V digital voltmeter was engage and a 0-10A multimeter. The multimeter was set to 2000µA and readings were taken. Resistance (?)| Current (µA) (±1µA)| Potential Difference (V) (±0.01V)| Current (A) (±1µA)| 470k| 0| 1.60| 0| 470k| 3| 1.60| 3.000E-06| 220k| 7| 1.60| 7.000E-06| 100k| 16| 1.60| 1.600E-05| 47k| 34| 1.59| 3.400E-05| 22k| 71| 1.59| 7.100E-05| 10k| 159| 1.58| 1.590E-04| 4.7k| 335| 1.56| 3.350E-04| 2.2k| 694| 1.52| 6.940E-04| 1.0k| 1444| 1.44| 1.444E-03| 470.00| 3290| 1.54| 3.290E-03| 220.00| 6810| 1.49| 6.810E-03| 100.00| 14120| 1.40| 1.412E-02| When the resistance reached 470.00?, the sensitivity on the multimeter had to be changed from µA...If you want to get a full essay, order it on our website: Ordercustompaper.com

If you want to get a full essay, wisit our page: write my paper