I am currently designing a circuit that uses a 5V 2A power brick. The circuit requires a current source and I have seen good efficiency with Ohm's Law. The current is variable through a 2k potentiometer. However, now I need to design a circuit that gives the user the option of using the pot or using a current generator. This is what I had in mind for a very simple circuit:
Is this a kosher way of doing this? The 5V is always on meaning current is always flowing through the resistors but is leaving the switch open (open circuit) good practice?