The circuit shown is powered by a battery with 8 = 15 V. R1 = 109, R2 = 25 , and R3 = 31 . Solve the following problems by using Kirchhoff 's laws. They may also be solved using Ohm's Law and the concept of equivalent resistance. That will not be the case for the Recommended and Optional Problems. 1. [1pt] *riiir Find the change in potential across R1. 2. [1pt] *m'ir What current ows through R3? 3. [1pt] *f Calculate the drop in potential across R3