added doc, #51

doc/implementation_notes.md

@@ -0,0 +1,15 @@
+# Ohm's Law - Implementation Notes
+
+This document contains notes that will be helpful to developers and future maintainers of this simulation.
+
+## Model
+
+This sim uses axon.Property throughout the model and view for storage of properties and 
+notification of changes.
+
+Start by reading the model description model.md
+
+## View
+
+
+The view adds batteries around a circuit to demonstrait current. It also has sound.

doc/model.md

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+# Ohm's Law model
+
+This document describes the model for the Ohm's Law simulation.<br>
+
+The model describes the current of a straight ohmic wire. I is the current through the conductor in units of amperes, 
+V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms.
+More specifically, Ohm's law states that the R in this relation is constant, independent of the current. This simulation's
+model is simple. It represents this formula.
+
+The Formula is
+I= V/R or
+Current = Volts / Ohms

js/ohms-law/view/FormulaNode.js

@@ -117,7 +117,6 @@ define( function( require ) {
           .timesMatrix( Matrix3.scale( entry.scaleA * value + entry.scaleB ) );
       } );
     } );
-
   }
 
   ohmsLaw.register( 'FormulaNode', FormulaNode );