In Figure, a voltmeter of resistance R v = 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 potential across R and i is the ammeter reading. The voltmeter reading is V', which is V plus the potential difference across the ammeter. Thus, the ratio of the two meter readings is not R but only an apparent resistance R' = V'/i. If R = 85.0?, what are(a) The ammeter reading,(b) The voltmeter reading, and(c) R'?(d) If RA is decreased, does the difference between R' and R increase, decrease or remain the same?

Transcribed Image Text:

R.