Reg Edwards wrote:

"Cecil Moore" wrote

Prad is found by integrating the Poynting Vector over a
certain radius.

Cec, what's the Poynting Vector?

Same thing as a power flow vector. The dimensions are
energy per second per unit area. If the power flow vector
is integrated over the entire surface of a sphere of radius
r, the result is total radiated power. I thought maybe you
and Mr. Poynting might have worked together at some time in
the 20th century. :-)

Poynting, John Henry (1852-1914)
English physicist, mathematician, and inventor. He devised
an equation by which the rate of flow of electromagnetic energy
(now called the Poynting vector) can be determined.

http://www.cartage.org.lb/en/themes/...oynting/1.html
--
73, Cecil http://www.qsl.net/w5dxp


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Cec, what's the Poynting Vector?

Same thing as a power flow vector. The dimensions are
energy per second per unit area. If the power flow vector
is integrated over the entire surface of a sphere of radius
r, the result is total radiated power. I thought maybe you
and Mr. Poynting might have worked together at some time in
the 20th century. :-)

Poynting, John Henry (1852-1914)
English physicist, mathematician, and inventor. He devised an equation by
which the rate of flow of electromagnetic energy
(now called the Poynting vector) can be determined.

S = E X H