All Questions
Tagged with electricity electrical-engineering
69
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Flow of charges in two different materials
Consider two cylindrical conductor rods: one copper rod and one aluminium rod. The rods contact at a circular face, aligned coaxially.
Their exterior circular faces are connected to some DC voltage. ...
- 31
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Will an appliance metal case get alive if touched by the neutral wire?
My phyiscs textbook only discusses what will happen if a live wire touches a metal case and how it turns alive, however, I was wondering, will the same effect happen to the metal case if touched by ...
- 377
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200
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What device is universal for electrostatics?
In The varieties of material existence, Michael Nielsen says the following:
"It’s easy to design a programmable device which is universal for electrostatics in any given closed region of space. You ...
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Why electric field increase near the cable connected in AC 220V socket even current is zero?
If I put low frequency electric field meter near the connected cable in AC 220V socket, he show 1200 V/m even if device is turn OFF(zero current), if disconnect cable from socket, field drop to 8 V/m.
...
- 613
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Current flow with no resistance
Imagine a simple circuit consisting of a battery with potential $V$ connected to a resistor with resistance $R$ by a loop of copper wire with $0$ resistance. It is obvious that a current $I=\frac VR$ ...
- 366
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What's the proportion of energy received on an overloaded generator?
I'm trying to understand the underlying physics with how generators work. I found this question which had some interesting answers, but it does not include all the details I'm after.
Suppose I have a ...
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If the rotational speed of a turbine at a power plant doubles, does its voltage, current or power double? [closed]
Somehow, I cannot find a simple answer to this question, or a simple equation or equations...
All other things being equal, if a turbine at your local power plant instantaneously doubles its rpm (or, ...
- 4,509
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743
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Why does the power remain constant during the stepping up and stepping down of current in transformers?
I understand quite a bit of transformers, their structure and other concepts and formulas related to mutual induction. However I'm not able to explain why the electrical power has to be constant ...
user248823
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Is it possible that two electric engines that has equal max rpm can work differently under load?
Two electric engines let's say has 3000 rpm with no load, but if I say they cope with work differently: one becoming weaker than the other under load or friction. Is it possible? If yes, why?
- 349
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Why do electrical storms cause metal objects to vibrate?
I am curious about the vibration of metal objects as a sign of an impending lightening strike. This is apparently a common occurrence; so much so that a quick google search will yield many pages ...
- 3
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467
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Magnetic core, and a DC solenoid
A DC solenoid creates a magnetic field B.
A highly permeability magnetic core is added to solenoid to increase B.
Now, there is change in flux, due to the increase in magnetic field. What would be ...
- 1,110
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Will the electrical potential difference between the Windward and Leeward sides of a mountain range generate electrical current?
I would like to know if it is possible that the electrical potential difference between the Windward side and the Leeward side of a mountain range, due to a thunderstorm occurring on the Windward side,...
- 478
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2
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172
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What is the difference between horizontal units and horizontal scale at an oscilloscope?
This is a picture of the data of a given measurement by an oscilloscope. I would like to know what the difference between horizontal units and horizontal scale at an oscilloscope is. I would be so so ...
user277332
0
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1
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Physical Meaning of Joule Integral
I have been reading literature on fuses and came across the joule integral or $i^2t$ value many times. Often, it is referred to as energy but I am confused because shouldn't energy be $E=RI^2t$? I ...
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528
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Physics vs Electronics (Smartphone charger)
Basically, an electric charger consists of a transformer, which transfers electrical energy from one inductance to another..
َAs i imagine the process physically the first circuit (inductance) should ...
- 67