Need help getting a voltage and current reading with myDAQ

I have set up a VI using the DAQ assistant with the myDAQ, I am using the ai0 port for a voltage reading and using the DMM for my current reading, the circuit is working as I am measuring the voltage on a resistor after the ammeter but I am unable to get a current reading in order for it to work. If I have something wired wrong please let me know, thank you. My circuit is a 12VAC power supply, going through a potentiometer to drop the voltage to 8VAC, which passes through a resistor, ammeter is in series after this and attached to another resistor to complete my loop, the AI0 for my volt meter is connected across the second resistor, I have the proper voltage reading when I run the VI, but am unable to get a current reading to display. Thanks for the help.
Attachments:
Mikes Project2.vi ‏134 KB

I mean I can't get a proper current reading as a numeric value, I have my power supply going to a potentiometer to change my voltage level and then have 2 resistors, I am measuring the current between the 2 resistors. By doing so I am getting a value but not the same value I am getting on my multimeter, I am also having trouble with the calculation using the formula R=V/I in my formula node. If I use input controls I can get the formula to work properly, as soon as I connect it to the outputs of what I am trying to read, the formula node doesn't work.

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