Linked Questions

35
votes
8answers
9k views

Is electricity really the flow of electrons or is it more involved?

I am new to the physics category of the Stack Exchange site. I apologize if my question is wrong, too broad, simple, or worded incorrectly. I am just trying to figure out what is true and false when ...
58
votes
6answers
7k views

In what order would light bulbs in series light up when you close a long circuit?

For a few days, I was thinking of this question. Lets assume we have a simple circuit that is 100 meters long. And lets say that we have bulbs A, B and C connected to the circuit's 30th, 60th and ...
29
votes
10answers
7k views

Is every open circuit a capacitor?

I think that even open-ended wires can let AC current flow through them, just with a low capacitance. I also think an antenna could be a capacitor and open ended. Am I thinking correctly?
3
votes
5answers
439 views

In a simple battery + resistor circuit, what form of energy is lost from the electrons upon exiting the resistor?

I will give this question a little context. Firstly, as I understand it, as soon as I "close the switch" on a circuit, electric current pretty quickly establishes a steady state where, at any given ...
1
vote
3answers
806 views

When talking about potential difference in a circuit, whose work done are we talking about?

I'm asking this because it seems to me that when we talk about PD around a charge (i.e. potential difference between infinity and a point), we're talking about the work done per unit charge by an ...
4
votes
6answers
735 views

What is the exact mechanism of flow of electricity? [duplicate]

When a steady current flows through a conductor, the electrons in it move with a certain average ‘drift speed’. One can calculate this drift speed of electrons for a typical copper wire carrying a ...
1
vote
3answers
600 views

How can a current carrying wire be electrically neutral if the wire at rest is already electrically neutral? (relativistically speaking)

I am stationary with respect to a conducting wire This conducting wire is electrically neutral (From observation) Current is now made to move within this wire. The motion of charges will be seen ...
1
vote
5answers
272 views

Paradox in Circuit Theory

Consider the simple case of a battery in series with a resistor, mediated by conducting wire. At steady state, the charge carriers are circulating around the circuit at constant speed through the ...
-1
votes
1answer
508 views

Distance moved by a point on a rubber band when the band is stretched

Take a rubber band of length $l$ and mark a point $(\cdot)$ on it at $x^{th}$ distance assuming the elastic rubber band to be along the $x$ axis beginning from $x=0$. My main query is: when the band ...
0
votes
3answers
210 views

Why is it often assumed that parasitic (or "stray") capacitance is in parallel?

Consider a simple RC circuit operating in the DC regime. Depending on the specifics of the experimental setup, there can often be a significant amount of parasitic (or "stray") capacitance. In every ...
1
vote
3answers
56 views

Can electron concentration vary in computer circuits?

I'm currently reading Frank Wilczek's new book Fundamentals: Ten Keys to Reality and I've come across the following passage: Inside modern computers, information is stored and processed in ...
1
vote
1answer
53 views

Where do Photons in Hot "Box" Come From?

I've read through some related questions, like here, but these don't quite answer my question. Say I have an oven at room temperature, and I raise the temperature to 400 K. During this process, the ...
0
votes
0answers
48 views

Can a beam of light, coherent or otherwise, conduct electricity, as does flame

Can a beam of light, coherent or otherwise, conduct electricity.