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| Veritasium "How Electricity Actually Works" |
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| rfeecs:
--- Quote from: electrodacus on May 22, 2022, 09:42:56 pm ---??? Have I not mentioned electrons that are a physical particle and they have a charge. It is almost like you are denying that capacitors are an energy storage device. --- End quote --- So charge equates to energy? --- Quote ---We are discussing electrical energy not thermal energy. ... Radio waves are on the other side of the infrared closer to DC. --- End quote --- I sense a contradiction. Sounds like infrared and radio waves are both in the realm of electrical energy. |
| electrodacus:
--- Quote from: rfeecs on May 22, 2022, 10:11:30 pm --- --- Quote from: electrodacus on May 22, 2022, 09:42:56 pm ---??? Have I not mentioned electrons that are a physical particle and they have a charge. It is almost like you are denying that capacitors are an energy storage device. --- End quote --- So charge equates to energy? --- Quote ---We are discussing electrical energy not thermal energy. ... Radio waves are on the other side of the infrared closer to DC. --- End quote --- I sense a contradiction. Sounds like infrared and radio waves are both in the realm of electrical energy. --- End quote --- Charge Q=C*V and energy is 0.5 * Q * V If you have an ideal circuit meaning no resistance then a 12V ideal voltage source charging an 1000uF ideal capacitor will result in 72mJ being transferred from source to capacitor with no loss so there is no infrared. Total electrical energy in a closed system before charging the capacitor and after is the same and no work was done. With resistance half of the energy so another 72mJ will be lost as heat so 50% efficiency. With a more efficient DC-DC circuit to transfer energy you can get to say 90% efficiency so 72mJ in capacitor plus 8mJ wasted as heat. |
| SiliconWizard:
Charge held by a capacitor is potential energy. |
| Naej:
--- Quote from: rfeecs on May 22, 2022, 09:33:03 pm --- --- Quote from: Naej on May 22, 2022, 09:25:40 pm --- --- Quote from: TimFox on May 22, 2022, 05:31:12 pm ---Can energy (or power) at an appropriate frequency propagate down a waveguide, inside the metal walls? --- End quote --- Yes. --- End quote --- Is it a trick question? Inside .. ??? --- End quote --- I think it was, but a correct answer is that current/energy is propagating inside the metal walls. Now the skin depth is typically very small, but it's still inside. |
| TimFox:
--- Quote from: Naej on May 22, 2022, 10:50:45 pm --- --- Quote from: rfeecs on May 22, 2022, 09:33:03 pm --- --- Quote from: Naej on May 22, 2022, 09:25:40 pm --- --- Quote from: TimFox on May 22, 2022, 05:31:12 pm ---Can energy (or power) at an appropriate frequency propagate down a waveguide, inside the metal walls? --- End quote --- Yes. --- End quote --- Is it a trick question? Inside .. ??? --- End quote --- I think it was, but a correct answer is that current/energy is propagating inside the metal walls. Now the skin depth is typically very small, but it's still inside. --- End quote --- My statement was ambiguous: I suggested that power propagates down the length of a waveguide, in the air/vacuum that is included in the guide's cross-section, inside the metal walls, in the form of traveling fields. At those frequencies, the skin depth is very thin, and current does flow within that depth in the walls to establish the boundary conditions. |
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