Question 13 (a) Define the electromotive force (e.m.f.) of a power supply. (b) The circuit below is used to determine th

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Question 13 A Define The Electromotive Force E M F Of A Power Supply B The Circuit Below Is Used To Determine Th 1 (50.72 KiB) Viewed 27 times

Question 13 (a) Define the electromotive force (e.m.f.) of a power supply. (b) The circuit below is used to determine the e.m.f. and internal resistance of cell C. V Cellc А Bundation R. The current I is changed by adjusting the variable resistor and readings of the current and corresponding p.d., V across the cell terminals are as recorded below. I/A V/V 0.25 1.47 0.50 1.29 0.75 1.11 1.00 0.93 1.25 0.75 1.50 0.57 1. Plot a graph of V/V on the y axis against I/A on the x axis. ii. Show that V = E - Ir Use the graph to determine the e.m.f., E, of cell C. iv. Use the graph to determine the internal resistance, r, of cell C. V. Why has the resistor, R, been included in the circuit for this investigation?