All Questions
Tagged with voltage electrical-resistance
727
questions
-4
votes
1
answer
69
views
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
views
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
vote
3
answers
89
views
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
5
answers
216
views
Why is my idea of voltage drop wrong?
when battery is connected to 2 ends of a wire, potential difference is created, this causes electric field causing electrons to move, the field gives the electron electric potential and the thus ...
- 19
2
votes
1
answer
69
views
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
69
views
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
0
votes
6
answers
136
views
What is electromotive force? What's its relationship to Voltage? + clarification of confusion
So first of all, yeah I know that the electromotive force is not a force (the name was coined by Alessandro Volta I think).
About Power and dissipated power
The power with wich a battery provides the ...
- 11
0
votes
2
answers
72
views
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
0
votes
3
answers
76
views
Behaviour of current in Pure capacitive circuit with DC voltage across
A circuit has just 1 capacitor and a DC Battery (V volts) and the wire has no resistance. At time $t=0$ the capacitor is completely uncharged. How current in this circuit changes with time?
What i ...
- 367
0
votes
2
answers
42
views
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 ...
0
votes
1
answer
55
views
What is the voltmeter measuring the PD of?
In the circuit diagram, the cell has an internal resistance, but when the switch is closed what does the voltmeter measure,
the pd of the cell, or the components in series?
- 111
1
vote
2
answers
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....
- 111
0
votes
1
answer
46
views
Discharge of a capacitor with variable backvoltage?
I understand that the voltage of a capacitor as it discharges overtime is $$V(t)=V_0e^(-t/RC).$$
I've also heard people say things like "voltage is relative. The voltage to the ground or the ...
0
votes
1
answer
74
views
Electricity: Ohm law vs Power in the Water analogy
I'm trying to understand electricity principles with the water analogy. I know this analogy is not perfect, but so far it has helped me the most.
To recap:
voltage (volt) is like water pressure
...
- 107
0
votes
1
answer
81
views
I find two different answers using Kirchoff's rules on single loop [closed]
I found this question in a book asking for voltage $X$. I allowed them to use any method they want. I too after revision using kirchoff's loop rules am getting too different answers. Please help me to ...
