Hello,

i have a circuit like this:

left side of the circuit with a Power supply +1V ---- Resistor 220 ohm ----- right side of the circuit with a power supply +1.5V

Would this give a problem for the powersupply's / resistor?

 

Depends on what kind of power supplies they are.

 

Could you tell me why?

 

Hi digitsboy,
I would suggest you answer @kubeek reasonable question.
More info please.
E

 

Unless the Negatives are joined together , then No current will flow in the resistor.

If the Negatives are joined only 0.5V is across the resistor.