All Questions
29
questions
1
vote
1
answer
113
views
Derivation and theory for $I = kV^n$ [closed]
I performed an experiment in college to study the nature of a filament of a lamp, determine $k$ and $n$ in the relation mentioned, and study the variation of wattage of a lamp. I assume ohm's law is ...
- 33
0
votes
2
answers
78
views
Why doesn't charge accumulate in a loop?
When learning about electromagnetism at my university, electricity flow is generally shown as a conductor with a high potential at one end and a low potential at the other and thus charges flowing ...
- 755
0
votes
1
answer
42
views
Do electrons move faster towards the end of a circuit?
As 1 coulomb electrons go through 1 volt of potential difference, they gain 1 joule of energy. So in s series circuit, do electrons move faster towards the end of the circuit where they went though a ...
- 35.4k
1
vote
5
answers
2k
views
Field inside a wire?
This answer gives a great explanation of why the field inside a wire connected to a battery must be equal at all points: Why doesn't the electric field inside a wire in a circuit fall off with ...
- 7,980
1
vote
1
answer
11k
views
Current against the inverse of resistance graph, $I = V/R +c$
If I have a plot of current ($y$ axis) against 1/Resistance ($x$ axis).
The circuit it is measured from is a simply 2 resistors connected in parallel to battery, where the potential across the ...
- 1
0
votes
4
answers
84
views
About electric field and electric potential
We know that electric potential is the negative of work done by electric field in moving a unit charge from infinity to that place.
This statement shows that electric field causes a potential ...
Buzz♦
- 16.3k
0
votes
2
answers
469
views
Direction of current flow in circuit with multiple cells
As the point $A$ is earthed we know that its potential is zero, same is true for point $B$. Due to the cell between $B$ and $C$ we can say that potential at $C$ is $-3V$. So the potential at point D ...
CommunityBot
- 1
0
votes
2
answers
287
views
Voltmeter connected to parallel circuit
This is my current understanding. Voltage is defined to be the potential difference between 2 points, hence it only makes sense for a voltmeter to be connected in parallel. But why must this voltmeter ...
- 73.7k
0
votes
3
answers
1k
views
How does current actually flow in a wire?
When I was in my school I was taught that the electric field due to the battery is along the wire (from $A \rightarrow B \rightarrow C \rightarrow D $) and these are responsible for electrons at each ...
- 195
2
votes
4
answers
1k
views
Why is current density in a conductor of uniform cross sectional area constant at all points?
According to what I was taught, if current was dispersed “uniformly,” current density would remain constant.
So, in a conductor, the 'current density should be the same at all points.' But, given that ...
- 21.8k
1
vote
2
answers
1k
views
Two charged spheres connected by a wire
I have a few doubts about this problem. So we have two charged spheres of radius $r_1$ and $r_2$, one is initially charged with a charge $Q$, while the other one is initially without charge. The ...
CommunityBot
- 1
0
votes
2
answers
393
views
Potential difference across two points in a current-carrying wire [duplicate]
I have had this doubt for quite a while and I have tried reading answers to similar questions but I'm still not sure.
If I connect a voltmeter at A and B, what would be the reading? Is it going to be ...
- 1,072
3
votes
1
answer
5k
views
What is the difference between electric spark and electric arc?
In my student book they separate these two and indicate that sparks need high voltage to occur while arcs need low voltage with normal or low pressure and electric arcs CAN come with heat and bright ...
- 1,340
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, ...
- 2,646
1
vote
1
answer
108
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What is the point of using an inverting amplifier in a circuit? [closed]
This may be a simple question to most of you, but I'm having trouble understanding the concept behind the use of an inverting amplifier.
What is the purpose of using an op amp in an inverting ...
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