All Questions
10
questions
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Does a person at the top of a tall building receive less electric shock compared to a person at a lower level?
We know that resistance $R$ of a material is given by:
$$R=\rho\frac l A$$
where $\rho$ is the resistivity of the material, $l$ is its length and $A$ is its area of cross-section.
Further, concrete ...
- 5,306
3
votes
5
answers
2k
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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
1
vote
2
answers
1k
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Why does a bird not get electrocuted when it is sitting on a high tension electric wire? [duplicate]
Why does a bird not get electrocuted when it is sitting on a high tension electric wire?
- 35
15
votes
3
answers
7k
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Tree vs lightning rod: why does one burn and the other not?
I have this simple question, but I cannot find the answer.
I saw this video about a plane getting hit by lightning. In it, Captain Joe explains why people do not get electrocuted. This has a simple ...
- 314
1
vote
2
answers
1k
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Does a fuse/circuit breaker blow easier when there is high load on the grid?
Short version: When there is a high load on the power grid in general, does it make it more likely that my fuse will blow?
Full version: I'm renting an apartment in Rome, where we are currently ...
- 113
0
votes
1
answer
684
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Electric discharge through my knuckle
In some particular days, it seems that my car is somehow at a different potential from the ground. When I get out my car and I wear my sneakers (that I think are better insulators than other kind of ...
- 1,764
1
vote
0
answers
147
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Dangers of AC currents at different frequencies.
I'm trying to understand the dangers of different types of electrical currents. This question has been answered quite well but in reference to the above image I found here AC current at very high ...
- 111
-4
votes
3
answers
182
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Doesn't any massive conductor look like "ground" to an AC supply?
I've been puzzling over this excellent answer to the perennial "Why don't I get shocked by a hot wire if I'm not grounded?" question. The orders of magnitude just don't seem right for two reasons:
...
- 924
1
vote
1
answer
113
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How is the efficiency of an electric motor affected? [closed]
Consider that I'm having a motor (AC/DC) and the power switch is on and it's being supplied power and of course the motor is rotating.
Now, I continuously start switching off and on the power. For 1 ...
- 11
52
votes
6
answers
286k
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Why is AC more "dangerous" than DC?
After going through several forums, I became more confused whether it is DC or AC that is more dangerous. In my text book, it is written that the peak value of AC is greater than that of DC, which is ...
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