Track & Wire Resistance

Most people who do any type of wiring at least know one electrical property of wires.  Resistance.   This applies to all forms of wires or more correctly ANY electrical conductor including track rails.   We generally have an idea that the more resistance there is in a given conductor, the more voltage drop there will be in the conductor as it caries power between the DC power pack and the train that is running from it.   There is a simple equation called Ohms Law that describes just that:  

V = I * R.  Where: V = Voltage in Volts, I = Current  in Amps  R = Resistance in Ohms