On 20 Mar, 02:21, Tuno wrote:
I can never keep these rules straight in my head, so I was happy to
find this cheat sheet:

http://www.evparts.com/img/voltsampsohmwatts.PDF

There is one obvious typo: adding watts and ohms is meaningless (top
left).

And why the hell use E for volts? Not only would V be clearer, E is
also used as electric field strength (V/m)

Ian