All Questions
34
questions
-1
votes
2
answers
109
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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 ...
- 218
0
votes
3
answers
102
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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 ...
- 97.9k
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 ...
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-1
votes
1
answer
791
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Does current flow inside a battery?
When connected in a circuit, does current flow inside a battery. If yes, in which direction?
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3
answers
1k
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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?
CommunityBot
- 1
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 ...
- 36.1k
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, ...
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 ...
- 2,075
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 ...
-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.
- 326
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 ...
- 2,646
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 ...
- 73.7k
0
votes
1
answer
46
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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, ...
- 2,646
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?
CommunityBot
- 1
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. ($\...
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