Richard Harrison wrote:
Roy Lewallen wrote:
"A better reason to avoid "stored" is that power isn`t stored at all,
anywhere. Anyone who believes so should be able to tell us how many
watts are stored in a 50 Ah, 12 volt battery."

The 50 Ah of energy stored in a battery may be withdrawn at a rate
determined by the load, so it is a variable.

Ah is a unit of charge, not energy. The battery, making the simplifying
(and invalid) assumption of constant voltage during discharge, contains
2.16 Mj of energy.

Velocity in a transmission line is a constant determined by
constructtion of the line. Thus, energy stored in the line is determined
by its length, voltage, current, and phase angle. These predict the rate
of energy transfer (power).

So the rate at which a transmission line transfers energy depends on its
length? If I put 100 watts into a one wavelength cable and get 100 watts
out, will I get 200 watts out if I extend the cable to two wavelengths?

Roy Lewallen, W7EL

Arrgh! I did it again!

Roy Lewallen wrote:

Ah is a unit of charge, not energy. The battery, making the simplifying
(and invalid) assumption of constant voltage during discharge, contains
2.16 Mj of energy.

That's 2.16 MJ, not Mj.

It'll sink in eventually . . .I hope.

Roy Lewallen, W7EL

Roy Lewallen wrote:
"Ah is a unit of charge, not energy."

The most common 12-volt battery is the lead-acid storage battery used in
automobiles. It should not be allowed to become completely discharged
nor to remain less than fully charged for a long time. The battery`s
capacity is rated in amperes x hours. The discharge rate is assumed to
be 8 hours. Slower discharges can be supported for more ampere-hours and
faster discharges likely won`t meet the rated ampere-hour product.

A 50 Ah battery would be expected to deliver about 6.25 A for a period
of 8 hours provided its electrolyte does not rise to more than 110
degrees F. 2-volt cells can be discharged down to 1.75 volts per cell
or a voltage of 10.5 volts for the 6 cells of a 12-volt battery.

Best regards, Richard Harrison, KB5WZI

Roy Lewallen wrote:
"So the rate at which a transmission line transfers energy depends on
its length?"

No, it depends on the power fed into the line.

Storage in the line depends on its length, plus the incident and
reflected energies per unit length of the line. Velocity is fixed by
construction of the line so a slow velocity factor allows more energy
storage as the source energy output is constant and independent of the
line`s velocity factor.

Best regards, Richard Harrison, KB5WZI