College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 19

For the circuit shown in Figure P18.46, the voltmeter reads 6.0 V and the ammeter reads 3.0 mA. Find (a) the value of R , (b) the emf of the battery, and (c) the voltage across the 3.0-k resistor. (d) What assumptions did you have to make to solve this problem