All Questions
Tagged with voltage electric-current
793
questions
-4
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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
3
answers
63
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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
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3
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89
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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
1
answer
69
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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
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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
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69
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Can resistors having equal magnitudes of potential difference be considered to be in parallel?
More specifically, if potential difference across a resistor, is exactly negative of the potential difference across another resistor, can they be considered to be in parallel? If so, why?
Can the ...
- 131
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2
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65
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How to find current direction from voltage value?
+2024.06.04. editted
I'm adding an example image of the data I have.
My circuit is a raster(matrix) format, and each cell (entry) is a node of the circuit. In the example, 1A is injected into the ...
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0
votes
2
answers
72
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Why is my voltmeter reading the supply voltage instead of load voltage?
I am very new to electronics and am a physics student working on an assignment.
I have a very simple circuit set up in my bedroom:
A power source of DC +0.7A and +5.0V with a single resistor of 100 ...
- 3
1
vote
1
answer
58
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Why does current lag behind voltage by 90° in an inductive circuit?
We can easily prove this with KVL, a little bit calculus, and trigonometry.
We get voltage as a sine function and current as a cosine function. Then we apply 'Add sugar to coffee' and get that current ...
- 104
0
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2
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42
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How is power dissipated proportion to current and current squared?
$P=IV$ and $P=I^2R$. Does this mean that $P$ is proportional to both $I$ and $I^2$? I don't understand this concept. And when should I use the various formulas for power? When another variable is ...
2
votes
2
answers
85
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How could free electrons flow in a conductor? If electrons actually flow in a conductor, then won't the atoms of the conductor become unstable?
I've read in many physics books that electrons flow due to a potential difference across a conductor, and that the flow of electrons is opposite to the current direction. But, if electrons move from ...
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3
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2
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808
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Could there be no current through a wire with a difference in voltage?
So I made this circuit on a simulator to help with my physics problem at school. As you can see from the picture, there is a voltage difference of 5V between B and D.
I know that the voltage ...
- 31
0
votes
1
answer
76
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Circuit without grounding
I'm learning about the notation of grounding.
In this post of Wikipedia, https://en.wikipedia.org/wiki/Floating_ground, it is said that
Conductors are also described as having a floating voltage if ...
1
vote
2
answers
63
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Why can define the electric potential (voltage) in alternating current?
(All SI unit used in this question)
The electric potential U is defined in electrostatic field that The electric field is the (negative) gradient of some scaler verctor, if and only if the electirc ...
- 13
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2
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49
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Voltage/current direction of AC on circuit diagram?
Consider the following simple circuit consisting of an AC generator with voltage $V$ and a resistance $R$. As a result, current $I$ flows. Below the corresponding time-voltage diagram of the generator....
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