All Questions
41
questions
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38
views
Force on charge carriers in a simple circuit
Is it true that in a simple circuit where a simple conducting wire is connected to a battery, the force on each charge carrier is same in magnitude ? If yes, then can you explain how? I know that if ...
1
vote
2
answers
119
views
Why does the power loss in transmission cable increase when resistance is increased?
In transmission cables, why does power loss increase when length of conductor is increased? According to the formulas V=IR and P=I²R, When we increase the length, the resistance increases, while the ...
0
votes
1
answer
74
views
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
123
views
Current by change in position of charges
I have been thinking about the idea given below
Consider the following situation
I have a rod which has a mass $m$ and hence does have the virtue to perform work against the gravitational field of ...
0
votes
1
answer
33
views
Analysis of Current for infinitesimal time
Suppose we have a hydrogen atom and electron is revolving in a orbit around the nucleus. We have to find current due to the revolving electron.
Current = ev / 2πr
( e = charge of electron)
( v = ...
- 109
0
votes
1
answer
641
views
Why Do Van De Graaff Generators Only Shock When Grounding Someone?
When someone touchs the metal sphere of the Van De Graaff Generators, the charge on them builds up, causing the famous hair raising. However, why is it when a person is rapidly grounded by someone ...
- 101
0
votes
1
answer
19
views
Electrostatic attraction between charges in different media
Imagine you have two non-conducting spheres of density a (a < density of water). Therefore the spheres float on the surface of water with a portion of their bodies immersed in water. Now how do you ...
0
votes
1
answer
150
views
Would a grounded copper heat sink located near a room's ceiling be an effective way to reduce a room's temperature?
I am thinking about a cheap but effective way to reduce the temperature of my bedroom in my apartment during hot summer nights. I live in an old apartment building and the air conditioner located in ...
- 478
0
votes
1
answer
2k
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Is it possible to convert static electricity into current electricity?
Generally, static electricity is created by friction between two or more different materials and it doesn't flow through a circuit.
On the other hand, current electricity is the flow of electrons ...
- 1,072
0
votes
3
answers
100
views
What is the definition of direction of current?
Wikipedia defines the direction of current as:
The direction of conventional current is arbitrarily defined as the direction in which positive charges flow.
But suppose a region where there is a non-...
- 480
1
vote
1
answer
300
views
Potential difference between two hollow spheres and amount of current flow
If two Hollow Spheres with radius $r_1$ and $r_2$ have charge $q_1$ and $-q_2$ in them respectively(charges are evenly distributed in the surfaces).The spheres are separated by a distance d .Now We ...
- 27
-1
votes
3
answers
1k
views
If the earth is negatively charged why is lightning striking it?
So, as far as I know, the Earth is negatively charged, and there are such things as lightning strikes which travel from clouds to the Earth- that would mean the clouds in a thunderstorm are positively ...
- 109
0
votes
1
answer
42
views
Can current due to potential difference of earth's crust and ionosphere charge objects?
A man fixes outside his house one evening a two metre high insulating slab carrying on its top a large aluminium sheet of area $m^2$ . Will he get an electric shock if he touches the metal sheet next ...
2
votes
2
answers
169
views
Confusion over Van de Graaff vs. Electric Fence
It is said "It is not the volts that kill you, but rather the current".
However, volts is directly related to current as V= IR (current x resistance).
Since the resistance of one particular ...
- 45
0
votes
2
answers
95
views
Can someone please explain the difference between an electric charge and electric current? [closed]
Well I understand the definition my question was that we measure charge by calculating 6.24 *10 powers 28 in one second then what is electricity if it is the rate of flow of charge is,t it's the same ...
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