Hi thats what I thought....if its a series circuit with no parallel paths. Thanks for that info. Now im confused what "Audiofilo" meant?If by opening the circuit you mean arranging it so only the resistors are being measured (no parallel paths), then you should be able to use a multimeter and see 30 ohms total resistance.
I think that Audiofilo said thay you would need to create a "closed" circuit formed by the three resistors in series and the multimeter. That is a way to see things, and technically it is a closed circuit. Of course, the resistance of a resistor or association is always measured with at least one end of the resistor or association free, so eventual parallel components (parallel to the resistor or association, so to speak) that may exist in your circuit won't affect your measurement.Hi thats what I thought....if its a series circuit with no parallel paths. Thanks for that info. Now im confused what "Audiofilo" meant?