An ammeter model consists of an ideal ammeter in series with a 20-? resistor. It is connected with a current source and an unknown resistor R? as shown in Fig. 2.133. The ammeter reading is noted. When a potentiometer R is added and adjusted until the ammeter reading drops to one half its previous reading, then R = 65 ?. What is the value of R??
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By the current division principle, the current through the ammeter will be one-half its previous value when
R = 20 + R?
65 = 20 + R? Rx = 45 ?
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