Energy loss in a capacitor
This is a typical problem in undergraduate physics: When a charged
capacitor in connected to an equal uncharged capacitor through a
resistor, the final energy in the capacitors is less than the initial
energy. This loss in energy is dissipated in the resistor as heat
(Joule Heating). Now if the capacitors are connected with
resistanceless wires (superconducting, for example), then the deficite
in energy has to be explained as energy radiated as electromagnetic
waves (due rapid change in current).
My question is, why do we consider the deficite energy to be dissipated
only as heat when a resistor is connected? Because even in this case,
due to non-linear variation of current, some energy is bound to get
radiated away. Is this because its amount is negligible? Do the laws of
Electromagnetism entail preference for Joule Heating over radiation?
Can anyone shed light on this ??
.
Relevant Pages
- Re: Resistor pulse handling?
... The two H outputs will go to a differential amplifer/attenuator to create a single ended, low-level sample of the output voltage. ... Trouble is, for instance a 1.25MHz cutoff filter with a 500 ohm resistor could potentially dissipate 11.25W in the ressitor on transitions, even though the RMS current is only 17.7mA. ... start with a 100 ohm resistor from the source to node 1 that has a capacitor to ground; set the capacitor value to ten percent of the original calculated value. ... Do not know energy content of what flows thru resistor thru capacitor, but some whiz could do the math. ...
(sci.electronics.design) - Re: Resistor pulse handling?
... start with a 100 ohm resistor from the source to node 1 that has a capacitor to ground; set the capacitor value to ten percent of the original calculated value. ... Do not know energy content of what flows thru resistor thru capacitor, but some whiz could do the math. ... I would dare say that energy may be in the same ballpark. ...
(sci.electronics.design) - Re: Mystery about "c".
... In GR, Energy and time are inversely varied, so that the ... The power output, Power = Voltage x Current can be ... me that a vacuum had an "impedance" of 377 ... By my resistor experiment there could be, ...
(sci.physics.relativity) - Re: Energy loss in a capacitor
... capacitor in connected to an equal uncharged capacitor through a ... the final energy in the capacitors is less than the initial ... This loss in energy is dissipated in the resistor as heat ... of Hertz on radio waves did just that. ...
(sci.physics.research) - Re: Energy loss in a capacitor
... capacitor in connected to an equal uncharged capacitor through a ... the final energy in the capacitors is less than the initial ... When you apply circuit theory, you assume that the circuit is small compared to the wavelength of electromagnetic radiation corresponding to any significant frequency, and the only loss mechanism is Ohmic resistance. ...
(sci.physics.research) |
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