All Questions
41
questions
8
votes
5
answers
29k
views
How does insulating footwear prevent an electric shock?
The reason I have always heard to explain the reduction of electric shock when we wear insulating footwear goes as follows:
When electricity passes from our body to the ground, an electric circuit ...
5
votes
1
answer
1k
views
Speakers and Static from Hands
Why is it that when you touch the a bare male end of a speaker feed that the speaker makes hissing noises? Is it just (eddy?) currents running through you?
user24082
4
votes
7
answers
34k
views
What is the difference between conventional current and electronic current?
what is the difference between conventional current and electronic current?
How are they linked to one another?
4
votes
2
answers
1k
views
Does current flow in the wire when only one terminal of the battery is earthed?
Let me specify beforehand that this question has been asked previously but I haven't been able to satisfy my curiosity.I know a battery maintains a potential difference between it's terminals , let's ...
- 1,103
3
votes
3
answers
4k
views
Grounding on the wooden floor
Let's suppose that I'm touching a live wire and standing on a wooden floor. Will I be shocked? Or e.g. standing in a plastic tub filled with water. I cannot imagine that there is a closed circle to ...
- 51
3
votes
5
answers
2k
views
Basic question about electric shock
When we are negatively charged, and we touch a doorknob for example, why does the shock happen (i.e. the flow of charge)?
I understand that the electrons want to flow to positive charges, and I know ...
- 39
3
votes
1
answer
285
views
Electricity from lightning
According to the internet, a lightning strike contains about 5 billion joules or 5 GJ. How was this calculated?
Another thing: Once the lightning strike a metal grounded rod, a current will flow. ...
- 413
2
votes
2
answers
241
views
Is equal charge distribution impossible in most cases?
Let us consider a scenario where one have a cubical stack of 64 similar cubes,like this one.
As it is a single conductor, let us put $ne$ amount of charge in this cube such that $n$ is not a ...
user106015
2
votes
1
answer
170
views
Open current loops in metal conductor
Hello everyone,
I have this question, "can Ac current flow in an open circuit ?", I give the example of a coil carrying an AC current placed above a conducting surface, since we have an AC current, ...
- 130
2
votes
2
answers
679
views
Discharging a capacitor
Suppose I have a charged capacitor, meaning there's a voltage (electric potential difference), say, $2V$, between its two plates. We don't know the electirc potential of the individual plates, right? ...
- 205
2
votes
2
answers
169
views
Confusion over Van de Graaff vs. Electric Fence
It is said "It is not the volts that kill you, but rather the current".
However, volts is directly related to current as V= IR (current x resistance).
Since the resistance of one particular ...
- 45
2
votes
1
answer
4k
views
Residual Resistivity in alloys and metals
Residual Resistivity
I saw that the graph of resistivity to temperature of alloys like nichrome is like so
Meaning that even at 0 K it has some resistivity just like copper :
I read some where "...
- 950
1
vote
3
answers
7k
views
Why does holding an electrical switch in between on and off states cause sparks?
If air is a bad conductor, then why do sparks develop when an
electrical switch is held in between on and off states?
Why are sparks generated when cables carrying heavy electric current
are brought ...
- 362
1
vote
1
answer
5k
views
Charging by induction (and grounding)?
The very familiar phenomenon of charging by induction includes bringing a charged object near an uncharged sphere to induce a separation of charges in it and then grounding the charge (same as the ...
- 3,148
1
vote
2
answers
123
views
Why does the power loss in transmission cable increase when resistance is increased?
In transmission cables, why does power loss increase when length of conductor is increased? According to the formulas V=IR and P=I²R, When we increase the length, the resistance increases, while the ...
