Assuming you have a fixed set of values to be entered, and aren't looking to support arbitrary calculations, then this a very simple task. First example off th

Assuming you have a fixed set of values to be entered, and aren't looking to support arbitrary calculations, then this a very simple task. First example off the top of my head: http://www.dannyg.com/examples/res2/resistor.htm http://www.dannyg.com/examples/res2/resistor.htm