Here is something that you all might find usefull.
Its a webpage you open that has a list of tools you can use quickly.
voltage divider calculator
Resistor color matrix
Series LED resistance calculator
And a OHMS LAW calculator.
Im sure theres more that can be added... If you have any suggestions... please do.
The attached file is a ZIP.
All applets / script / js have been removed, no exception list needed.