An external resistor R is connected between the terminals
Chapter 25, Problem 25.74(choose chapter or problem)
An external resistor R is connected between the terminals of a battery. The value of R varies. For each R value, the current I in the circuit and the terminal voltage Vab of the battery are measured. The results are plotted in Fig. P25.74, a graph of Vab versus I that shows the best straight-line fit to the data. (a) Use the graph in Fig. P25.74 to calculate the batterys emf and internal resistance. (b) For what value of R is Vab equal to 80.0% of the battery emf?
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