THis is great, never thought about being able to enter the voltage value manually although I had done something like this in earlier projects, with limited success. This gives me ideas for variations and more projects, like, maybe making the resistor or resistors all manually enter rather than random varables, or for future projects like 3 resistors in parallel...

I am finding however after testing this that the value of current goes way off the mark after pressing enter a few times on the screen, thus other values go wonky too. The value of current should always be the value of total resistance, something goes wrong, sometimes it is bang on and other times it is not, looks like the decimal place becomes lost...
Looking at the script and not seeing why as the math looks good....