If a current of 15 A is flowing through the 15 ohm resistor.  What is the voltage?
_____R  5 Ohm _______R 10 Ohm__________________	
 |						|		|
 |						|		|
 _					______|____	       R 15 Ohms
___					|	        |		|
 |					|	        |		|
 |				R 25 Ohms	R 50 Ohms	|
 |					| 	        |      R 8 Ohms
 |					|_________  |		|
 |						|		|
 |___________________________________|___________	|
If you decrease or increase the 25 ohm or 50 ohm resistor what happens? Does the current or voltage change?  Please briefly explain.