J.B. Wood wrote:
Cecil Moore wrote:
The unit of power is the watt. If power is being
transmitted, the transmitted power would have units
of watts/sec or joules/sec/sec. What would be the
physical meaning of joules per second squared?

I have no idea what you're talking about, Cecil.

I know and you are not alone. I was taught about
power transmission in college but it was actually
energy transmission they were talking about. The
power company doesn't charge me for power - they
charge me for KWH, i.e. energy.

Consider a Bird wattmeter in a flat transmission
line. It is at a fixed point reading watts. Are
the watts moving? The Bird is displaying joules/sec
passing a fixed point. The joules are certainly
moving but are the joules/sec moving? As you noted,
it seems that if the joules/sec are moving then the
joules must necessarily be accelerating.

You can measure the number of cars passing over
a bridge in one hour and write that number on your
notepad. The cars are moving but is that cars/hour
measurement written on your notepad moving? If so,
where is it going?
--
73, Cecil http://www.w5dxp.com