V=IR. Not a good question tbh as there many formulas for working out voltage using different variables and constants.
http://wiki.answers.com/Q/What_is_the_formula_for_...

The formula for simple DC voltage drop is: VDrop = Vmeasured at the input of
http://www.chacha.com/question/whatistheformula...

No, you need one ohm per volt per amp. Since you don't know what the current is (amps) using a resistor is guesswork. Instead get 3 1N4001 diodes and wire them in series with each
http://answers.yahoo.com/question/index?qid=201210...

transpose for all the elements. t. r. c.
http://www.askmehelpdesk.com/electricalengineerin...
