Hi and welcome,
first: use code tags (I will be displayed much more readable) and always post the error message(s) from the log.
What I can see is that you haven't understood what views are and how they work. Take a look at the beginners guide here:
http://www.b4x.com/android/forum/threads/beginners-guide.9578/
To help you right now:
1. The declaration of the Edittext's are missing (should be like Button1 -> Private Edittext1 as Edittext)
2. What are the names of the Edittext's? You may not use the same name for them as another variable (f.e. Amperage is a variable OR an Edittext)
3. To get the content of a Edittext you use: Amperage = Edittext1
.Text
4. You could name the variable amp and the Edittext AmpET -> amp = AmpET.
Text
5. To check a valid value you can change the input_type of the Edittext in the designer to decimal numbers.
6. In "Button1_Click" check the value by "If AmpET.Text.length > 0 then ..."