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PHYSICS : Technology in Space> Solar Cells & Electric Circuits> Internal Resistance E = I (R+r) E = IR + Ir and V = I x R Since IR = E - Ir then V = E - Ir Method: A circuit was set up as above, incorporating a variable resistor and an ammeter and a voltmeter to measure the current and voltage across the resistor respectively. Results: The readings of V and I were recorded as follows: V I 5.70 1.55 6.24 1.00 6.55 0.72 6.75 0.57 6.87 1.48 7.09 1.40 7.15 1.35 7.22 1.31 7.29 0.28 7.34 0.25 A graph was plotted to show V against I and from this the values of E and -r can be calculated. [See graph] Conclusion & Calculation: V = -rI + V = -rI + E -r = 7.34/0.25 = 29.36? E = 7.85 The value of E extrapolated from the graph is 7.85, and the internal resistance of the power supply is 29.36?. ...

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