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In Fig 27-53, a voltmeter of resistance R_(v)=300 Omega and an 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 of emf epsi= 28.5 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 Omega what are (a) the ammeter reading. (b) the voltmeter reading, and (c) R' (d) If R_v is increased does the difference between R' and R increase, decrease or on the same? |
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