All Questions
30
questions
1
vote
1
answer
104
views
If a downed powerline contacts the metal chassis of my car, can I touch any metal parts of my car while sitting inside of it?
consider the following situation. I parked my car underneath some high-voltage lines – let’s say 380 kV-lines. Suddenly, one of the lines breaks in the middle due to a storm and one end of the (still ...
- 11
0
votes
2
answers
1k
views
Why can't we use a slip ring instead of a split ring in a dc motor?
I've been taught that in a dc electric motor a split ring is used to connect the two ends of the rotating coil to two carbon brushes so that
The wire does not get twisted and
The current passing ...
- 252
0
votes
4
answers
70
views
Do you "lose" electricity when you course it through subpar conductors?
Imagine I had a basic circuit - say the classic 9V battery on one end, a couple of wires, and a little light bulb on the other.
Of course, in a real world example those wires would probably be ...
4
votes
6
answers
2k
views
Electric current definition
I'm trying to understand electric current. Some resources say that it is the flow of charge, and other resources say that it is the quantity of charge that passes through a cross-sectional area over a ...
1
vote
2
answers
758
views
What force moves electrons through a conductor that is rotating in a magnetic field [closed]
Is it the magnetic force ( F= qv +B ) or the electromagnetic force (F= q(E+vxB) that acts on the electrons of a conductor that is moving in a magnetic field?
Thanks.
user232620
3
votes
1
answer
690
views
Does the shape of a wire affect the electric current in it in any way?
Say we have a straight wire connected across two terminals carrying electricity between them. If everything is kept the same (voltage across the two terminals, resistance of the wire, etc.) will there ...
- 195
5
votes
4
answers
977
views
If an electron is repelled by another electron how is it that we get an electric current?
As we know that an electric current is a flow of electric charge in a circuit, and in electric circuits, the charge carriers are often electrons moving through a wire.
Now, since we know that like ...
0
votes
1
answer
62
views
GENERATION OF CURRENT DUE TO ELECTRON FLOW
Why do flow of electrons generate current? whenever an electrons flows through a wire it generates electricity why does it actually happen?
- 31
1
vote
1
answer
93
views
Does the electron in wire too move because of voltage difference?
When we talk about electricity through a circuit because of a battery it is said that the electrons from negative terminal travel to positive terminal of the battery.
I can't help but imagine about ...
- 300
0
votes
1
answer
118
views
When AC electricity is generated, how does the current flow? [duplicate]
I have read multiple different versions of how AC current flows in our power lines. How does the current flow? Is the energy just photonics waves passing through electrons that vibrate or are ...
- 1
0
votes
2
answers
148
views
Resistance in special cases
I am curious-
I know that resistance doubles when length does, and that resistance would be halved if cross sectional area was doubled -
But is there such a case of special conditions where It ...
- 3
2
votes
1
answer
362
views
How does electricity work exactly? [closed]
So it just isn't popping for me how electricity actually works.
AC at 60 Hz can swap directions 60 times a second and drift at roughly 1 m/s while they kind of ping pong forward with constant push ...
0
votes
2
answers
465
views
How does the current become homogeneous within a circuit?
I have two questions:
In a given circuit with resistances of different values connected in parallel, there is a different build up of electrons when the power source is turned on. Then, how is the ...
- 1,235
1
vote
2
answers
919
views
Does electric current create positive ions while flowing through a conductor?
As the conduction electrons are free to move randomly, i.e they are not restricted to a particular atom, then why don't these atoms get positive charge due to loss of these conduction electrons?
- 41
0
votes
1
answer
66
views
Mechanism of electricity in conductors
In mechanism of electricity in conductors my teacher said the free electrons collide with positive lattice and this positive lattice is oscillating about its mean position. Ok for producing current ...
- 35