Use the slider to set the input voltage, Vin, between 0 and 10 Volts. The current is depicted by the blue arrow whose width is scaled by the amount of current.
Enter a resistance for R1 between 1 and 10 Ohms:
The voltage, Vin, is Volts,
so the current is given by $I1=\frac{Vin}{R1}$= Amperes (or Amps).