In Fig. 27-39, a voltmeter of resistance R_v= 300 Omega and ammeter of resistance R_A= 3.00 Omega are being used to measure a resistance R in a circuit that also contains a resistance R_(0) =100 Omega and an ideal battery with an emf of epsi = 18.0 V. Resistance R is given by R =V/i, where V is the potential across R and i is the ammeter reading. The voltmeter reading is V', which is V plus the potential dilference across the ammeter. Thus, the ratio of the two meter readings is not R but only an apparent resistance R' -V/i. If R =85.0Omega what are (a) the ammeter reading. (b) the voltmeter reading, and (c) R'? (a) If R_A is decreased, does the difference between R' and R increase, decrease, or remain the same?

In Fig. 27-39, a voltmeter of resistance R_v= 300 Omega and ammeter of

1.	In Fig. 27-39, a voltmeter of resistance R_v= 300 Omega and ammeter of resistance R_A= 3.00 Omega are being used to measure a resistance R in a circuit that also contains a resistance R_(0) =100 Omega and an ideal battery with an emf of epsi = 18.0 V. Resistance R is given by R =V/i, where V is the potential across R and i is the ammeter reading. The voltmeter reading is V', which is V plus the potential dilference across the ammeter. Thus, the ratio of the two meter readings is not R but only an apparent resistance R' -V/i. If R =85.0Omega what are (a) the ammeter reading. (b) the voltmeter reading, and (c) R'? (a) If R_A is decreased, does the difference between R' and R increase, decrease, or remain the same?
Answer» Answer :(a) 0.828 A; (B) 7.29 V; (C) `88.0 OMEGA` (d) remain the same

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