In Fig. 27-62, a voltmeter of resistance RV 300 and an ammeter of resistance RA 3.00 are
Chapter 27, Problem 56(choose chapter or problem)
In Fig. 27-62, a voltmeter of resistance RV 300 and an ammeter of resistance RA 3.00 are being used to measure a resistance R in a circuit that also contains a resistance R0 100 and an ideal battery of emf 12.0 V. Resistance R is given by R V/i, where V is the voltmeter reading and i is the current in resistance R. However, the ammeter reading is not i but rather i, which is i plus the current through the voltmeter. Thus, the ratio of the two meter readings is not R but only an apparent resistance R V/i. If R 85.0 , what are (a) the ammeter reading, (b) the voltmeter reading, and (c) R? (d) If RV is increased, does the difference between R and R increase, decrease, or remain the same? RR0VAFigure 27-62 56.
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