Questions tagged [electric-current]
A measure of the rate at which electric charge is transported (especially through a circuit), it has units of charge/time.
3,367
questions
0
votes
0
answers
39
views
Proof of concept of symmetry for circuits [closed]
In my textbook the method of symmetry for solving complicated symmetrical circuits . I have the intuition of why the idea of symmetry works but I’m unable to prove it mathematically using Kirchoff’s ...
- 21
-4
votes
1
answer
69
views
Is my simplified explanation of Volts vs Current correct? [closed]
I was struggling to find any meaningful difference between Volts and Current, when studying the basics of Ohm's law.
The sentences explaining Potential Difference, between the negative and positive ...
- 117
0
votes
0
answers
28
views
Can field effect transistor s channel s varying depletion layers generate electric flux and control output current indirectly
Since magnetic field lines without need of contact attracts iron filing and drag them closer so that magnetic field line remain smallest.same analogy applied to field effect transistor ions in the ...
0
votes
2
answers
44
views
How is a steady current maintained in case of motional EMF if net force on electrons is zero?
I looked at the derivation of emf induced in case of a conducting rod entering a uniform magnetic field perpendicular to it, emf$=Bvl$ if $B$ is the strength of magnetic field, $v$ and $l$ are ...
- 31
0
votes
0
answers
16
views
Force on current carrying loop due to non-uniform magnetic field
I was been taught that when there is a non-uniform magnetic field then the Force on a current carrying loop with Magnetic Moment M is F = M(dB/dx) where B is magnetic field.
I can't get hold of this ...
0
votes
0
answers
48
views
Force acting on an infinite wire with current inside a magnetic medium
I've recently stumbled on an electromagnetics problem that I don't quite understand.
There is an infinite wire carrying current I that is placed inside a medium with magnetic permittivity μ1. At a ...
2
votes
0
answers
24
views
Is there any specific terminology for this type of current in spintronics?
In spintronics, there are several types of currents:
Spin-polarized current: The two spins flow in the same direction with unequal contributions.
Perfectly spin-polarized current: Only one species of ...
- 21
0
votes
3
answers
63
views
Why do lamps in circuit have potential difference but two points in cable without anything in the middle of it have no potential difference?
I'm preparing for my EE major, this is my starting point.
1
vote
3
answers
89
views
Visualization of resistance [closed]
What does a resistor do in an electrical circuit? Does it impede the flow of electrons by increasing offering a path that offers a large no. of collisions? How can i visualise it, i have been told to ...
- 19
2
votes
2
answers
96
views
Current loop and electromagnetic energy
Take a fixed circular loop of wire in a uniform magnetic field. As far as I can tell, the work we have to do to accelerate the electrons in the wire so a particular current is attained is independent ...
- 61
0
votes
2
answers
57
views
Growth of Current in an Inductor Connected Across a Battery [duplicate]
When baterry is connected across inductor with no resistance in circuit, won't the current flowing through it be zero, as inductor back emf will counteract the effect of potential difference due to ...
2
votes
2
answers
94
views
Electric force is zero in a solenoid
This is a question from Young and Freedman's University Physics.
The book's answer says that the electric forces are zero because the wire is electrically neutral, with as much positive charge as ...
2
votes
1
answer
69
views
Potential difference when two emf sources are connected in a simple loop circuit
I am having difficulty understanding the equation below for the potential difference between the two terminals of an electromotive source when two sources are connected from Sear and Zemansky's ...
0
votes
1
answer
24
views
Maximum voltage that a system of two capacitor withstands when connected in series [closed]
Question:
A capacitor of capacitance 1 micro faraday withstands the maximum voltage 6kV while a capacitor of 2 micro faraday withstands the maximum voltage 4kV. What maximum voltage will the system ...
0
votes
6
answers
146
views
Why is current the same when batteries are connected in series? [closed]
I struggle to understand why the current remains the same in the circuit when batteries are connected in series.
Update
I can reason with it if someone can confirm the update.
If the speed of ...
- 13