Kirchhoff's loop rule:
i = Vmeter/Rv
Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large.
(a) A voltmeter with resistance Rv is connected across the terminals of a battery of emf "EMF" and internal resistance r. Find the potential difference Vmeter measured by the voltmeter.
(b) If emf = 7.50 v and r = 0.45 Ω, find the minimum value of the voltmeter resistance Rv for which the voltmeter reading is within 1.0% of the emf of the battery.
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