15 years ago, I vaguely remember using PI and Ohms law, what for I do not remember. Going through it all again, I don't ever see the PI formula mentioned, I do see Ohms law, but no real specific uses? Does anyone use these for electrical troubleshooting?
Pi is not used for electricity except MAYBE for figuring wire diameters.
Pi is usually for figuring circular areas and volumes.
Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."
May be asking about E = P/I, or E(volts) = P(power) divided by I(current). Its a variation, or derivative, of Ohm's Law.
One example of using it would be with heating elements. Where you have two known values and are figuring out the third.
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It may be used for heating if customers want to confirm unit is performing as per spec (been asked this one once)
Sizing a transformer if you know volt and amperage.
Sizing a fuse for a transformer
Many use that I forgot