Page 749 - SUBSEC October 2017_Neat
P. 749

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                         (iii)   Using values obtained from the graph in Figure 3, calculate the power dissipated in
                             the resistor R, when there is a current of 0.25 A.


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                                                                                                   [3 marks]


                 (b)    A second identical cell is added in series with the original cell and the experiment is repeated.


                    (i)     Determine the new e.m.f and internal resistance of the combined cells.

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                                                                                                   [2 marks]

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                          (ii)   Given an e.m.f. of 8 V and an internal resistance of 3 Ω, complete Table 2 using the
                                  equation for R given in Part (a).


                                                               TABLE 2: RESULTS OF EXPERIMENT


                       I (A)                   1/I (A )                            R (Ω)
                                                     -1
                        0.1
                        0.2
                        0.5
                        0.8
                        1.0

                                                                                                   [3 marks]



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