When teaching physics many years ago I remember having to make sure that my students didn't use the term "ampage" when referring to electric current, because I had seen from exam mark schemes that it would loose them the credit for an otherwise correct exam answer. I never liked this because although "ampage" is most definitely an incorrect term, it is still, all the same, frequently used by professional and hobby practitioners of electrical engineering. So if a student used the term, it actually indicated to me that they had gone outside my lessons to pursue something concerning electricity or physics. where they had picked up extra curricula knowledge and vocabulary. Whilst such misconceptions have to be dealt with and corrected, it always seemed to me that the penalty for showing interest and initiative in cases like this far outweighed the "sin". It went very much against my personal mantra throughout my teaching career of "do no harm" or be very careful not to put a student off my (or anybody else's for that matter) subject. The reason I am writing this today is that I have just learnt a new, to me, term after 45 years of electrical engineering of "Ampacity", https://en.wikipedia.org/wiki/Ampacity . Initially I thought this term belonged in the "ampage" camp, but it turned out to be correct terminology (At least in the USA anyway, but they have shown us how stupid they are by voting Trump for president!) Does this marking situation still exist? Do you agree or disagree with me on this, and has anybody else got any examples like this where they think the punishment outweighs the crime?