All Questions
23
questions
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74
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Why does the current flow through a wire if the wire is an equipotential surface? [duplicate]
From what I know, current flows across two points only if there is some potential difference across those two points. If that is the case, why does the current flow through a wire then?
See the ...
0
votes
2
answers
56
views
Current in a two capacitors system in parrallel
I solved this question and I got the values of charges on capacitors in figure B. But my question is charge on capacitors is getting redistributed,but how is it possible when potential difference ...
0
votes
3
answers
119
views
Why won't the bulb light? [closed]
Here's what the marking scheme says: "Capacitor gets charged first and acts as an insulator/blocks current".
However, electrons flow from negative to positive, so shouldn't the electrons ...
- 93
0
votes
0
answers
63
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Charging a single plate of a capacitor does not work
I charged a 100nF capacitor with 12V with a battery, then i disconnect the battery from the capacitor and connect the positive side of the capacitor to ground (which is an electron source) ...
- 35
1
vote
1
answer
278
views
How do you set up Kirchhoff's loop rule for a circuit with a charged capacitor, uncharged capacitor, and resistor?
If I connect a circuit with charged capacitor that has charge $q$ to an uncharged capacitor and resistor, how would I set up a differential equation that can be used to find the time constant? I know ...
0
votes
2
answers
119
views
Can current flow through a capacitor submerged in electrolytes?
Imagine two flat conducting plates (3 x 3), one as the anode and the other as the cathode, submerged into electrolytes (e.g. sea water) and a DC current is applied to this apparatus. Could current ...
- 155
1
vote
3
answers
442
views
Is it necessary that a capacitor stores energy but not charge?
Is it necessary that a capacitor stores charge? The definition of capacitor given in books is that it store electric energy. So is it possible that the capacitor does not store charge but stores ...
- 99
0
votes
0
answers
41
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How to use energy conservation in following case [duplicate]
A capacitor of capacitance C is intially uncharged is connected with a battery of emf ε.Find the heat dissipated in the circuit during charging?How can we apply energy conservation although there are ...
- 65
2
votes
2
answers
168
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Touching single line of AC Power and charge oscillation in body
If a person touches a single line of AC(Only on the live line, and no where else. Say he/she is hanging on the power line using one hand) as shown in the attached image, Do the ions in his/her body ...
- 23
2
votes
4
answers
14k
views
Is there a physical explanation for why increasing a capacitor's capacitance and the circuit's resistance decrease the capacitor's rate of discharge?
The voltage across a capacitor as a function of time is given by:
$$V=V_ie^{-t/RC}$$
Therefore, increasing the resistance and capacitance increases the time it takes for the initial voltage to drop ...
- 797
1
vote
2
answers
117
views
Why do generators need a complete circuit to move electrons but capacitors do not?
A charged capacitor will shock you if you come too close to it or touch it, and you are connected to the ground. A generator will only generate electricity if it has a complete circuit, it cannot just ...
- 615
1
vote
2
answers
4k
views
Charge flowing through switch when it is closed [closed]
The problem that I'm having is that the initial charges would have been 300 and 600 microcoulomb on the 3 and 6 microfarad capacitors respectively. But when the switch is closed there's some charge ...
- 21
0
votes
4
answers
8k
views
Why do Capacitors discharge?
I understand how capacitors charge and i know they discharge but i am so confused why they discharge. How do they suddenly know when they are full to discharge. I am doing a school report and really ...
- 21
0
votes
1
answer
540
views
How to measure residual charge in capacitor?
I understand how to measure capacitance of capacitor with multimeter but it is possible to measure residual charge of "half-discharged" capacitor?
- 185
1
vote
1
answer
81
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Are there losses in AC when passing through a capacitor?
A capacitor allows AC to pass through. From what I've read it's caused by the changing electric field in the space between the capacitor plates which causes a change in charge on the other plate of ...
- 1,043