"Evgenij Barsukov" <evgenij_b_no_spam@[EMAIL PROTECTED]
> wrote in message
news:fod86n$dpg$1@[EMAIL PROTECTED]
| Androcles wrote:
| > "Steve" <no@[EMAIL PROTECTED]
> wrote in message
| > news:wbqdnTZMuJIrizfanZ2dnUVZ_qiinZ2d@[EMAIL PROTECTED]
| > | Evgenij Barsukov wrote:
| > |
| > | > Steve wrote:
| > | >
| > | >> John Bailey wrote:
| > | >>
| > | >>> Is that a fact and reason based answer or just a guess? A
battery
is
| > | >>> not as efficient as a capacitor and there is a theorem from
sophomore
| > | >>> EE that "proves" no more than 1/2 the energy stored in a
capacitor
can
| > | >>> be recovered.
| > | >>
| > | >>
| > | >> Maybe at some EE correspondence school in outer Elbonia, but not
| > | >> anywhere creditable. Most capacitors are nearly 100% efficient at
low
| > | >> frequency and moderate charge/discharge rates, I have no idea
where
| > | >> you came up with some "proof" that no more than half can be
recovered.
| > | >
| > | >
| > | > Sorry man, it might not be obvious, but this effect is true,
easily
| > | > provable based on the differential equation describing capacitor
| > | > discharge and known to every electric engineer:
| > | > http://www.smpstech.com/charge.htm
| > |
| > | But we're not talking about the first-year method of charging a
| > | capacitor from an ideal voltage source through a resistor are we?
Nor
| > | are we talking about discharging through a resistor to a purely
| > | resistive load, are we?
| > |
| > | >
| > | > As other people have stated earlier, this applies only for
straight
| > | > linear capacitor / resistor systems without inductance.
| > | >
| > | > Switching systems with inductance is a different story and they
can
| > | > be 90-95% efficient.
| > |
| > | EXACTLY my point when I made the first rebuttal!! There is no
"theorem"
| > | that states with any sort of generality that "no more than 1/2 the
| > | energy stored in a capacitor can be recovered." In fact you can get
| > | nearly 100% out as heat, should that be your goal (as it often is in
| > | pulsed welding systems, for example). Period. End of story.
| >
| > At the EE correspondence school in outer Elbonia, if you drain
| > a tank of water you can only put half the water back, easily
| > provable based on the differential equation describing alcohol
| > ingestion and known to every hydraulic engineer that is currently
| > unemployed and wondering why he can't get a job even as a
| > plumber's mate in inner Elbonia, let alone as a car mechanic's
| > tea boy and general gofer in London.
| >
| > Might I suggest that Evgenij Barsukov is ineducable and suitable
| > plonk material?
|
| You want to measure credentials or salary?
Sorry man, it might not be obvious, but this effect is false, easily
provable based on conservation of energy as known to every
mechanical engineer.
http://www.kettering.edu/~drussell/Demos/SHO/damp.html
|
