All Questions
Tagged with voltage electricity
393
questions
-4
votes
1
answer
71
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
1
answer
105
views
Understand power rating in layman terms
I have recently started the chapter of electricity of class 8. I am not understanding the concept of power rating of appliances. When we say that a bulb is rated 220V-100W, which means, according to ...
3
votes
2
answers
39
views
How do I compute the voltage accross a cell membrane given microstate of neuron (distribution of charged ions)?
I am not a physicist, and I'm not sure what keywords to use to search for this.
I'm trying to understand how I could in theory quantitatively know, what the voltage across a cell membrane in a Neuron ...
- 1,772
5
votes
2
answers
135
views
What is the "closed circuit" of a bug swatter racket?
There are bug swatter racket that can kill fruit flies, mosquitos, or flies, if the insect touches the metal mesh.
However, when I look at the construction of the device, the metal mesh is all one ...
- 151
0
votes
3
answers
223
views
Why doesn't voltage increase when the wire length increases; there's more work to be done?
This Q&A did not answer my question.
The voltage of a circuit is the difference in each Coulombs potential energy at the negative pole, compared to the positive pole. At the negative pole, there's ...
- 248
0
votes
1
answer
38
views
Ideal Superconductor connected to Zero Voltage
If an ideal superconductor was just left alone, with no potential difference, what would be the current flowing in it?
According to Ohm's Law, $V = IR$
Hence, if a superconductor of $0\Omega$ ...
0
votes
2
answers
137
views
How do you measure AC voltage of your mains domestic electricsupply?
If I have a DC voltage source, I can connect a voltmeter across it and get the voltage value. But how do I find out the AC voltage of a voltage source? What will happen if I connect a voltmeter across ...
- 11
1
vote
1
answer
105
views
If a downed powerline contacts the metal chassis of my car, can I touch any metal parts of my car while sitting inside of it?
consider the following situation. I parked my car underneath some high-voltage lines – let’s say 380 kV-lines. Suddenly, one of the lines breaks in the middle due to a storm and one end of the (still ...
- 11
0
votes
2
answers
54
views
Piece of iron instead of a proper fuse
In a video game Dying Light 2, there are those electrical boxes that you open and then "fix" by putting a piece of iron (I suppose). Assuming voltage $U$ is being produced and is supplied ...
- 291
1
vote
3
answers
231
views
Electric shock: positive vs negative voltage
A high voltage wire can either have an large excess of electrons (net negative charge density), or a large defect of electrons (net positive charge density).
The voltage difference between the wire ...
- 2,982
0
votes
3
answers
87
views
How do we correctly handle a power source and a capacitor in parallel?
$\newcommand{\d}{\mathrm{d}}$
Here $V$ is an alternating supply, $R$ is a fixed resistor and $C$ is an capacitor. All components, including the diode, are ideal. Say $V(t)=V_\max\sin\omega t$ - with ...
- 221
-1
votes
1
answer
159
views
Why do we call high terminal the positive side?
I want to confirm if I understand something correctly.
We call the "high potential terminal" the positive side (cathode).
Though, electrons move from negative to positive. Logically, ...
- 525
-4
votes
1
answer
1k
views
If a person hanging on a live wire of 440 V in air with no contact with ground, will he get a shock why or why not? [closed]
my sir told me that he will get a shock, but why not bird then
he replied bird has legs acting as insulators
i am in confusion what is the right explanation to this
0
votes
2
answers
185
views
Explanation of Potential Difference
My question is to verify if my thought process below is correct.
So in a circuit the charge will flow (the current). When the charge flows there is resistance which is the collisions of the charge ...
- 37
2
votes
1
answer
117
views
What if we used massive voltages to create a Lichtenberg figure in acrylic?
https://en.wikipedia.org/wiki/Lichtenberg_figure
I cannot find anywhere online what the result would be if I used, for example, 1GeV compared to the 10-20MeV which are usually used. This is all ...
- 23