In the circuit shown in Fig. P25.66, R is a variable resistor whose value ranges from 0 to ∞, and a and b are the terminals of a battery that has an emf ε = 15.0 V and an internal resistance of 4.00 Ω. The ammeter and voltmeter are idealized meters. As R varies over its full range of values, what will be the largest and smallest readings of (a) the voltmeter and (b) the ammeter? (c) Sketch qualitative graphs of the readings of both meters as functions of R.
Figure P25.66
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