> John, I had annual electrical safety training at my former job and answered "What is Ohm's Law?" with V=IxR and was corrected by the instructor. He said it's actually I=V/R.
Well, strictly speaking, it's not even a law; it's the definition of resistance. (Newton's Laws of Motion are examples of scientific laws.) So, it might be better to say "R = V/I". Makes no difference, they're all mathematically equivalent.
> Also learned in my time in R&D that Ohm's Law does not apply to a welding circuit. But I can't explain why.
Well, it does, but in practice Ohm's Law only covers resistance and not inductance or capacitance. To properly describe a welding circuit you must include the inductive elements. And because welding is seldom steady state, you need to look at things in the time domain, which complicates matters quite a bit.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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