All Questions
23
questions
7
votes
2
answers
64k
views
Capacitor circuits with light bulb
Let's say we have a normal circuit with a light bulb, with wires and a battery.
When one places a capacitor in this circuit, how is the light bulb able to light up, even when the capacitor prevents ...
- 561
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
2
votes
2
answers
168
views
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
2
answers
679
views
Discharging a capacitor
Suppose I have a charged capacitor, meaning there's a voltage (electric potential difference), say, $2V$, between its two plates. We don't know the electirc potential of the individual plates, right? ...
- 205
2
votes
1
answer
87
views
Why there cannot be induction current between plates of capacitor while discharging?
If a capacitor gets charged by induction through the plates, then why there is no induction current between them while discharging instead of displacement current ?
- 137
1
vote
3
answers
446
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
1
vote
1
answer
279
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 ...
1
vote
1
answer
82
views
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
1
vote
1
answer
163
views
How increased current carrying capacity / ampacity affects wire gauge size [closed]
In selecting a suitable wire size for manufacturing:
If I have a material that has the same resistivity and density as Copper, but has a higher current carrying capacity / ampacity for the same ...
- 11
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
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
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
3
answers
5k
views
electron flow in capacitor with dielectric
if I make a circuit with a battery and a capacitor (with a dielectric inside),
how it is possible to get a current in the circuit? If electrons go from
one pole of the battery and they arrive to one ...
- 169
0
votes
3
answers
370
views
(Capacitance of a battery?) Finding the charge accumulated on a rod
We all know the expression for the potential difference across a conducting rod moving through a region with a uniform magnetic field:
$\epsilon = B l v$
Now my question is different. Is it ...
- 138