Answer Posted / 7anoter4
Vector is a physical notion which means
a quantity that are fully described by both a magnitude and
a direction. Speed, force, electric field intensity,
magnetic field intensity, current density and other are
vector defined by a magnitude and a direction.
With a field of quantities define as vectors you may use
function like gradient, curl and divergence and product as
vectorial or scalar.
Scalar it is a quantity defined complete by the magnitude
as current intensity, magnetic flux ,electrical potential
and other.
In electrical calculation- in alternative current system-
it is employed a quantity defined as phasor or phasor-
vector formed of two parts: one real and one imaginary
quantity.
For instance, the real part of a current could be I*cos(fi)
where fi it is the angle between supplied voltage
[considered as fi=0] and I it is the measured current
[intensity].An imaginary part is annexed in order to
complete the image I*sin(fi).
Then we have three possibilities: only real part-
considering fi=0, only imaginary part considering fi=90
degree or a complex number I*cos(fi)+I*sin(fi)*i i=sqrt(-
1) an imaginary unit.
So, the ac current[intensity] is not a vector and not a
scalar but could be a complex number or a real quantity-
depends on how you'll take the "fi".
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