General > General Technical Chat
Veritasium "How Electricity Actually Works"
electrodacus:
--- Quote from: hamster_nz on May 08, 2022, 02:07:52 am ---
Are you saying that if you have a lamp between two capacitors (so all three components are in series) that it is impossible to get the lamp to glow?
Because that would be "energy passing through the capacitors" to me. If not, where did the energy that makes the lamp glow come from?
--- End quote ---
I was mentioning a battery but yes if one of the capacitors is charged then yes.
It will only glow for a few moments and stop as soon as the two capacitors become equally charged. There is still energy to make the lamp glow in the two capacitors but they can not do that as energy will not flow through them.
There is no current flow through a dielectric (if there is then something is wrong and that is no longer a dielectric).
hamster_nz:
--- Quote from: electrodacus on May 08, 2022, 02:17:08 am ---
--- Quote from: hamster_nz on May 08, 2022, 02:07:52 am ---
Are you saying that if you have a lamp between two capacitors (so all three components are in series) that it is impossible to get the lamp to glow?
Because that would be "energy passing through the capacitors" to me. If not, where did the energy that makes the lamp glow come from?
--- End quote ---
I was mentioning a battery but yes if one of the capacitors is charged then yes.
It will only glow for a few moments and stop as soon as the two capacitors become equally charged. There is still energy to make the lamp glow in the two capacitors but they can not do that as energy will not flow through them.
There is no current flow through a dielectric (if there is then something is wrong and that is no longer a dielectric).
--- End quote ---
I've put a pair of LEDs between two caps, with a current limiting resistor. Where is the energy coming from that is making these LED glow?
I've used 2 LEDs so you can be sure that I am not playing any funny games with AC. One glows when DC voltage is applied, the other when the caps are discharged after DC is removed.
I can repeat the cycle over and over, so more energy is getting to the LEDs somehow, and charges are moving through the LEDs... but you say this energy is not going through the capacitors?
bsfeechannel:
--- Quote from: Naej on May 07, 2022, 11:22:27 pm ---It certainly deserves to be separated because the physical behavior is quite different:
--- End quote ---
Separated.
Since the 19th century, everybody thought that everything electric and magnetic, from DC to cosmic rays, through radio waves, heat, light, ultraviolet, X-rays and whatnot, is the manifestation of the same freaking physical phenomenon.
Now you're saying that they are different. I wonder why the Nobel Committee has not noticed you yet.
--- Quote ---Yes I can. Energy flows in wires and reappear in a lightbulb/engine/LED.
--- End quote ---
--- Quote ---Yes energy is transferred from the battery to the short, through the wire.
--- End quote ---
If you say so, it must be true.
SiliconWizard:
Considering capacitors is sure interesting, considering inductive coupling as well.
We know we can transfer energy without "wires". That's for sure. But what would the fundamental difference be? If there is any?
electrodacus:
--- Quote from: hamster_nz on May 08, 2022, 03:00:08 am ---
I've put a pair of LEDs between two caps, with a current limiting resistor. Where is the energy coming from that is making these LED glow?
I've used 2 LEDs so you can be sure that I am not playing any funny games with AC. One glows when DC voltage is applied, the other when the caps are discharged after DC is removed.
I can repeat the cycle over and over, so more energy is getting to the LEDs somehow, and charges are moving through the LEDs... but you say this energy is not going through the capacitors?
--- End quote ---
Use a battery. You have a low quality power supply that has a lot of ripple thus your capacitors are charged and discharged continuously.
Is basically an AC supply with a DC offset.
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