Stagger Lee wrote:

[snip]
2. The power density is related to the electric field and the
impedance of free space (120*Pi) by the formula Pd = e^2 / (120*Pi).

[snip]

Thanks for the reminder on the calculations. Funny but a couple of my
younger colleagues who think themselves quite the electronics men
still do not think 'space' has an impedance. There is nothing there,
after all.. That is what too much PCB layout/CAD work wioll do to one.
hehe

PJ