Re: Capacitor energy experiment

[Bernard Cleyet <anngeorg@PACBELL.NET>]

The error (heating in the switch do to the switching time can be
estimated by its temp. rise.  Typical triacs are so fast that they are
not heat sunk (sinked?).  (60 Hz, 120 V, and with a one kW load)

bc

p.s. why not indeed

Ludwik Kowalski wrote:

> My description of the experiment with the air capacitor
> was not complete. There should be an electronic switch
> so that charging is done in a different loop that discharging.
> The electronic switch would perform the same function as
> a mechanical switch but much more rapidly, for example,
> every 0.1 ms. Then the calorimeter would measure the
> "amount of heat" generated in N discharges, each
> delivering only 0.5*C*V^2 of thermal energy.
>
> If f=10 kHz and time is five minutes than N=10000*300.
> With C=5000 pF and V=300 volts the deposited thermal
> energy (Q=N*0.5*C*V^2) would be 675 J or 161 cal.
> Or 645 cal if V=600 volts. Too bad that getting a large
> C with an air capacitor is not easy. Ten radio capacitors
> of 500 pF in parallel? Why not?
> Ludwik Kowalski