On 7 Nov, 14:40, Cecil Moore wrote:
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

Cecil,
Velocity and acceleration are two different things
Velocity is the amount of movement and accelleration
is the rate of change of movement dependent on the
number of samples taken over a period of time
Joules are not necessarily accelerating.
Think Newton....ut + 1/2 f(t sqd)
Art
Art