Building Trust - Trust is key to coaching. The supervisor and employee relationship must have some level of trust for coaching to work. A mutual interest in the success of the other is critical. Trust can begin to develop through open, honest feedback and respect.
A resistor at constant temperature (ohmic conductor). Current is directly proportional to potential difference. Doubling the potential difference doubles the current in the circuit. The resistance remains the same. Plotting a graph of potential difference against current gives a straight line passing through the origin (0,0).
That is called Ohm's Law. Ohm's Law describes the behavior of a theoretical circuit element called a resistor which usually has a constant value of resistance. Actual resistors (and actual conductors) behave very much like the theoretical model. Changing the current through a resistor does not have any effect on the resistance. If the current goes up, then according to Ohm's law, the voltage must have gone up in the same proportion. There is a circuit element called a variable resistor (a.k.a., potentiometer, or rheostat).