Ladder
For each of the following circuits, solve for the voltage e_+ - e_-.  Enter
your answer as a Python expression, potentially containing the (case-sensitive)
variables V, I, and R.  Note that, like any other Python
variables, these are case-sensitive!
Circuit <printf %d>1
e_+ - e_- =  
Circuit 2 
e_+ - e_- =  
Circuit 3 
e_+ - e_- =  
Circuit 4 
e_+ - e_- =  
Circuit 5 
e_+ - e_- =