The letter j is used to signify that a number is an imaginary number in electrical engineering. Normally the letter i is used, but in electrical engineering j is used instead to avoid conflict with the symbol for current.
Animated definition of complex numbers and how they can be plotted on a two-dimensional plane
An imaginary number is one that when squared, gives a negative result.
Definition and meaning of the math word i. Includes a list of other pages that refer to this word
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