College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 77

A battery with = 6.00 V and no internal resistance supplies current to the circuit shown in Figure P18.12. When the double-throw switch S is open as shown in the figure, the current in the battery is 1.00 mA. When the switch is closed in position a , the current in the battery is 1.20 mA. When the switch is closed in position b , the current in the battery is 2.00 mA. Find the resistances (a) R 1 , (b) R 2 , and (c) R 3.