Practice Problem on Adding Resistors
                R1=1 Ohm
          +------/\/\/\------+            R4=3 Ohm
          |                  |      +------/\/\/\------+
          |     R2=7 Ohm     |      |                  |
    ------+------/\/\/\------+------+                  +------
          |                  |      |     R5=7 Ohm     |
          |     R3=3 Ohm     |      +------/\/\/\------+
          +------/\/\/\------+
If the current through R2 is 6 A, what is the voltage across R1? Give your answer to two decimal places.

ANSWER = 42.00 V