An ammeter model consists of an ideal ammeter in series
Chapter 2, Problem 2.73(choose chapter or problem)
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 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 What is the value of Rx?
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