Inductive reactance plane

So I'm learning about electronics and I have a question about coordinates on the Inductive reactance.

They are written as "R+jXl"

R is Resistance, Xl is Inductive Reactance. What is J?

j is your term for what mathematicians call i, the imaginary unit- a number that, when multiplied by itself, is -1.  The point is that your algebra will work out nicely, and you get results that jive nicely with physical phenomena.

See

http://en.wikipedia.org/wiki/Imaginary_unit#alternative_notations

Also, compare

http://en.wikipedia.org/wiki/Electrical_impedance

and

http://en.wikipedia.org/wiki/Complex_plane

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Basicly, since in electrical/electronical equations, you'll use i for current, it would be confusing to use the complex i mathematicians would use for the imaginary unit.

>>4

Yes.  That is true.