# Vector Average

In physics the Poynting vector represents the directional energy flux (the energy transfer per unit area per unit time) of an electromagnetic field.The SI unit of the Poynting vector is the watt per square metre (Wm 2).It is named after its discoverer John Henry Poynting who first derived it in 1884. 132 Oliver Heaviside also discovered it independently.Check Your Understanding. 1. To test your understanding of this distinction consider the following quantities listed below. Categorize each quantity as being either a vector or a scalar.

Vector Calculus Fourth Edition uses the language and notation of vectors and matrices to teach multivariable calculus.It is ideal for students with a solid background in single-variable calculus who are capable of thinking in more general terms about the topics in the course.Conventions for Describing Directions of Vectors. Vectors can be directed due East due West due South and due North. But some vectors are directed northeast (at a 45 degree angle) and some vectors are even directed northeast yet more north than east.Thus there is a clear need for some form of a convention for identifying the direction of a vector that is not due East due West due South

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