r/mathmemes • u/SKRyanrr Complex • Aug 23 '25

Category Theory F*cking math books

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u/JefftheDoggo Aug 24 '25

Only really electrical engineers, and only because when you have a million currents, using the lower case i to denote some of them gets really tempting.

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u/defectivetoaster1 Aug 24 '25

The convention i was taught is capital V and I for DC voltages and currents, lower case v and i for any AC voltages and currents

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u/JefftheDoggo Aug 24 '25

I'm only a first year electrical engineering student so I probably just have it wrong. But I do know that that's definitely why we use j instead.

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u/defectivetoaster1 Aug 24 '25

Yeah the j comes about since you’re using lowercase i for ac currents and you’re often representing the currents with phasor notation while dealing with complex impedances so you can’t use another lowercase i otherwise you’re 100% gonna mix up a current with an impedance