30. the following diagram shows the experimen power a circuit with two resistors: ri, 20 h wire between ri and r2 experimental set up in a r 1.20 ohm, and r2.30 pin a high school physics chool physics lab. a 120 volt battery is used to meter, al, is used to read the current of the r1 200 120 v am1 r2 300 part a: explain how the battery's electric potential difference affects the current in the circuit