Emf And Internal Resistance Of a Cell

Measuring potential and essential opposition of a stall Alice Stockdale mesa of contents| Background Physics| Pg 2| throw up| Pg2| Equipment dip| Pg2| | | | | | | | | Background Physics: Equation: emf = V + Ir. The Emf is the total Voltage available to a cellular telephone. The Ir is the Internal Resistance of a cell. This equation can be rearranged to use the equation for the Potential Difference (V) across the cell: V = -Ir + Emf This equation can then be compared with the equation for a straight line: V = -Ir + Emf y = mx + c This displays that the Ir will be represented by the slope of the graph and the Y wiretap will be the Emf. From these equations the graph expected will flip a negative gradient Aim: To carefully cake the Potential Difference across a resistor and the catamenia of the circuit. From this the Emf and Internal justification of a cell will be measured and calculated.

Equipment Needed: * Resistor * Ammeter * Voltmeter * Cell * railway car Range DMM * Multimeter * Datalogger Method: * Set up equipment as show: * Take repeated measures of A and V * darn results in a graph * Take repeat amend measures Results from experiment 1: In experiment one a 0-20V digital voltmeter was utilise 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| 1.59 0E-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 indirect request to get a full essay, order it on our website: OrderEssay.net

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