Page 748 - SUBSEC October 2017_Neat
P. 748
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(a) Several values of R and I are measured and plotted on a graph of R against , shown in
Figure 3. The equation of the graph is .
R/Ω DO NOT WRITE IN THIS AREA
80.0
60.0
40.0
20.0
0 1 /A -1
2.0 4.0 6.0 8.0 10.0 I
-20.0
Figure 3. Graph of R against DO NOT WRITE IN THIS AREA
(i) Use the graph in Figure 3 to find the internal resistance, r, of the cell.
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[1 mark]
(ii) Determine the e.m.f of the cell.
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[2 marks]
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