21.1 Exercise 25

Note: Data taken from figures can be assumed to be accurate to three significant digits.

Referring to the example combining series and parallel circuits and the figure, calculate $I_{3}$ in the following two different ways: (a) from the known values of $I$ and $I_{2}$; (b) using Ohm’s law for $R_{3}$. In both parts explicitly show how you follow the steps in the Problem-Solving Strategies for Series and Parallel Resistors.