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| Same polarity but different direction of current flow. How annoying! |
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| Circlotron:
Say we have a capacitor and we ground one end and begin sucking electrons out of the other end via a resistor. This end of the capacitor is positive polarity. Then we connect the resistor across each end of the capacitor and begin to discharge it. Now electrons are flowing back into the positive end of the capacitor. Same polarity, opposite direction of current flow! Does this situation have a name? Edit. positive and -> positive end |
| BravoV:
AC ? |
| S. Petrukhin:
--- Quote from: Circlotron on September 21, 2020, 01:12:51 am ---Say we have a capacitor and we ground one end and begin sucking electrons out of the other end via a resistor. This end of the capacitor is positive polarity. Then we connect the resistor across each end of the capacitor and begin to discharge it. Now electrons are flowing back into the positive and of the capacitor. Same polarity, opposite direction of current flow! Does this situation have a name? --- End quote --- We do not suck out electrons, we push them there more through the minus, and then they flow out of the minus. A capacitor stores energy in an electrostatic field. This inductance uses an electromagnetic field and it then returns as self-induction with reverse polarity. |
| greenpossum:
Sourcing and sinking |
| newbrain:
--- Quote from: greenpossum on September 21, 2020, 01:56:43 am ---Sourcing and sinking --- End quote --- To expand a little bit (conventional current flow in the following, not the topic here): Current flows from a higher potential to a lower one. In your example, the plate of the capacitor that is not connected to ground will be at a higher "positive polarity" with respect to the ground when discharging, but at a lower polarity (negative) with respect to the voltage source when changing - otherwise, current could not flow in to "suck electrons" out. Potential are always relative. Reference points are paramount. Edit: armature is not used in English AFAICS - Italian mother tongue shows... |
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