All Questions
34
questions
-1
votes
2
answers
109
views
Potential Divider Circuits
Consider the following circuit:
From my understanding, consider the series circuit without the $V_o$ part. The voltage must be used between resistors $R_1$and $R_2$. We know $V=IR$ from ohms law. As ...
0
votes
3
answers
102
views
Potential drop against internal resistance of cells in combination
Suppose two cells of emf and internal resistance e1, r1 and e2, r2 respectively are connected in series. The negative electrode of 1st cell is connected to negative electrode of the second cell. Why ...
- 1
-1
votes
1
answer
791
views
Does current flow inside a battery?
When connected in a circuit, does current flow inside a battery. If yes, in which direction?
- 11
0
votes
1
answer
183
views
EMF of source depends on the charge and the path then what do we mean when we say EMF of a source is $\epsilon$?
EMF of an EMF source (a battery for example) is defined as the work done by the non-conservative force(s) on charged particles as it passes through the terminals of the source divided by the charge of ...
- 480
0
votes
0
answers
63
views
Applying KVL to batteries with different EMF in parallel
Consider the circuit diagram below-
Two batteries of different voltages are placed in
parallel, however as I was told that KVL is applicable to all loops if there is no varying magnetic fields, ...
4
votes
2
answers
1k
views
What happens to electrons in a cut wire?
what happens to electrons in a cut wire.
I know it is dangerous but out of curiosity if there was a power cable cut and connected to the outlet, the electrons would be dispersed in the air when they ...
- 41
-3
votes
2
answers
49
views
What happens (from the first principle perspective) when you connect 2 negative terminals in a DC Circuit? [closed]
E is the electromotive force, r is the internal resistance.
- 1
0
votes
2
answers
306
views
Why current drops when voltage increases?
https://www.youtube.com/watch?v=ubZuSZYVBng&t=329s
In the video above the man put a 200 thousands volt ball near a non-charged one and a very tiny current appear between them. But I think with ...
- 59
0
votes
1
answer
46
views
Question on electricity and the basics of potential difference
I am having some difficulty understanding how batteries work. I don't quite understand what exactly potential difference is. My textbook says it is the work done per unit charge to move an electron, ...
- 169
0
votes
3
answers
1k
views
How does the battery create an electric field inside the conducting wire connected to its terminal?
In books, it is not explained exactly how the battery creates an electric field inside the wire. Also, is that the electric field inside the wire only or is it present outside the wire as well?
0
votes
0
answers
122
views
Why do potential difference between the terminals of an ideal battery remains equal to its $Emf$ even if it is connected externally
In an ideal battery, the battery forces are equal in magnitude to the electric forces (the ones that are present when battery is not connected externally) and thus we conclude that E.M.F. ($\...
- 155
2
votes
6
answers
1k
views
Why is internal resistance of battery considered outside the terminals although it is present between the terminals inside the battery
In ideal battery the internal resistance is zero whereas in non-ideal battery there is some internal resistance now this internal resistance is due to the battery material (electrolyte) and is present ...
- 155
3
votes
1
answer
555
views
Why Ohm’s law doesn’t work in these scenarios (inside ideal battery and in vacuum)?
Scenario 1 - Ideal battery
Suppose I have an ideal battery whose electrolyte’s resistance is zero. In the working battery there will be current flowing inside the battery also (due to battery forces) ...
- 155
1
vote
1
answer
94
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
1
vote
1
answer
191
views
Explanations for different current values inside a battery
I was just learning about what happens to current inside a battery, and my professor gave an example: Let's say we have a $1$ volt battery connected to a $1 \Omega$ load. Then he claimed that the ...
- 181
1
vote
2
answers
131
views
Current flowing inside battery/voltage source
Current is the flow of charges (many say electrons).
Do these charges flow just between the terminals of the source/battery (terminal to terminal) ?
Or
Do these charges flow through/inside the ...
- 1,441
0
votes
1
answer
326
views
Why do batteries need a loop to discharge?
I'm an electrical engineer who has been taught transistors and silison and solid state theory and all that. But when I apply the theory to batteries and cathodic protection, my understanding seems to ...
- 103
1
vote
1
answer
213
views
Why aren't salt water batteries used to power cars instead of lithium-ion?
I know salt water batteries are less efficient than lithium-ion, but water is safer, can be found anywhere, is cheap and 100% ecological. Even if it doesn't last long, you can refill anywhere. Why can'...
- 1,029
0
votes
2
answers
1k
views
Kinetic energy and current
When a battery is connected to a resistance circuit, we know that it loses energy because heat is emitted as a result of the collisions between the electrons and stuff, but my question is, is the ...
2
votes
2
answers
803
views
Does current flow when you connect a battery to earth?
Let's say that the earth has 0V and everything is ideal,
does current still flow and why?
- 49
-1
votes
1
answer
87
views
is this the reason why current doesn't flow over a resistance if there is another path without resistance? [duplicate]
Let's suppose that a single battery is connected with a wire, which does not have resistance. Electrons will start to flow , in reality, with a wire with resistance, a potential difference would be ...
- 1,235
1
vote
2
answers
153
views
Creation of electric field inside a conductor
My book says that as soon as the two ends of a conducting wire touches the two terminals of a battery, it generates an electric field inside the conductor. Why?
- 31
1
vote
2
answers
1k
views
What is the cause of opposite electric current direction of flow of current inside a battery?
My question is that why the direction of current inside a battery is different than that of outside battery?Can someone explain how current is even carried inside a battery because free electrons aren'...
- 51
0
votes
3
answers
4k
views
Current flow with batteries in series vs parallel
Taking let's say three ideal and identical batteries, why does the current flow increase when we add them in series compared to them being in parallel?
I can understand the height analogy for voltage ...
- 115
1
vote
2
answers
8k
views
Batteries in series vs parallel
As fa as I understand it, two identicle batteries in parallel will give double the amperage than just one battery and two batteries in series will give double the voltage. If my understanding is ...
- 31
2
votes
3
answers
596
views
How to vary the current using batteries?
I am making a door bell as a school assignment. It works by having a solenoid produce a magnetic field which attracts a pice of iron attached on a conductor. when the iron is attracted towards the ...
- 31
0
votes
4
answers
10k
views
Electrons moving in a simple circuit with a battery and a light bulb
I believe my understanding of electric currents is flawed and want some help to clear up a few things. I'm not looking for a precise scientific understanding, but to understand the basics. I'll try to ...
- 319
1
vote
3
answers
20k
views
Why does a battery die more quickly when more resistors are added to the circuit?
I will be explaining what I think:
A battery acts like a pump which provides energy to do work on negative charges to move them towards the negative terminal, and hence creating an electric field. ...
- 972
2
votes
4
answers
7k
views
How can there be a voltage when there is no current?
I'm told at school that the Electromotive Force (e.m.f) of a battery equals the potential difference between the terminals of the battery when there is no current.
How is that possible? How can there ...
- 121
4
votes
2
answers
8k
views
If I charge a battery using a much higher current, can it explode?
If I have a 12V 4Ah lead acid battery and use a battery charger that, let's say for example, can charge 10A, 50A, or 100A. If I theoretically turned it to 100A will the battery explode?
I understand ...
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