The letter "I" is normally used for direct current, or for the average current in the case of AC.
The lower-case version, "i", is used for the instantaneous current, in the case of AC.
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Since there are no equations following, the answer must be "none of them".
It represents the point of intersection on a graph.
M in roman numerals. However in current terms K could mean one thousand but it is actually 1,024.
As in Roman numerals: 100 = C and 1000 = M
x2 + y2 = r2