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Consider an automobile battery that has an emf of 12.0 V and a terminal voltage of 15.0 V while a current of 7.5 A is charging it. A What is the internal resistance, r, in ohms, of the battery?
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A battery has an emf of V and an internal resistance of r. What resistance R, when connected across the terminals of this battery, will cause the terminal voltage of the battery to be 0.5 V?
(a) R=0.5r
(b) R=2r
(c) R=4r
(d) R=r
(e)R= 0.25 r