All Questions
Tagged with voltage electrical-engineering
40
questions
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.
0
votes
0
answers
36
views
Is there any electronic devices that maintain charged state?
I want to know how to make electronic devices that are continuously charged to + or - state on which surface when voltage is applied to utilize the dielectric polarization property, or if there are ...
- 51
0
votes
1
answer
38
views
When forming an n channel in an N MOSFET, do the pn junctions of the drain-substrate and source-substrate parts disappear?
When forming an n channel in an N MOSFET,, do the pn junctions of the drain-substrate and source-substrate parts disappear?
Here's what I expected:
When gate voltage (higher than threshold voltage) ...
- 107
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
2
votes
1
answer
155
views
Voltage across the diode?
Why the voltage across an ideal pn junction diode remains 0.7 volts, even when the applied voltage exceeds 0.7 volts? Shouldn't it be the applied voltage minus the 0.7 V?
- 1,441
1
vote
1
answer
105
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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
71
views
I do understand Ohm's law but, how will current increase if voltage is a constant and resistance keeps decreasing?
An increase in current would mean an increase in kinetic energy of Coulumbs of charge flowing in the wire, so how does removing resistance give kinetic enrgy to the coulumbs flowing in the wire, how ...
0
votes
4
answers
1k
views
Kirchhoff's voltage law, signs?
Consider the circuit below from the book Electrical Engineering, Principles and Applications (p. 95). According to that book, we get from Kirchhoff's voltage law that
$$
-v_1+0.5v_x+v_2=0
$$
However, ...
- 261
9
votes
5
answers
4k
views
Why is it easier to raise AC current to high voltage than DC?
In my country (and maybe all around the world I don't know) once electricity has been generated, it is then raised to 200k Volts for transportation.
I know this is to reduce the loss. Given $P=U.I$ ...
- 201
1
vote
0
answers
34
views
Why are most solar panel rated at 12 volts or 24 volts? [closed]
Most solar panel come in 12 volts or 24 volts, why?
- 121
0
votes
1
answer
35
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If loads are perfectly balanced, and line resistances are zero, is ground wire redundant?
Here is my understanding of neutral and ground:
The return current through the neutral wire is the vector sum of three phase power. If loads are perfectly balanced, the vector sum is zero, and the ...
- 1
1
vote
3
answers
682
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Does voltage limit the magnetic force of a coil?
My question I had is whether it is strictly current that creates the magnetic force in the coil or if voltage is also relevant? The reason for this question is because I figure if it is just current ...
0
votes
2
answers
149
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How does electrical energy in parallel work out?how does less energy travel through more resistance,and lose the electrical energy which it not had? [duplicate]
Before asking my question,I want to talk about certain points
1.Lets suppose there is a battery of 12 volts,this means that the potential difference between the negative and positive terminal of the ...
- 151
12
votes
14
answers
12k
views
How do electrical devices limit the current flow from a socket?
How does a home appliance limit the amount of current that flows
through it?
Are there some resistors set up in series in order to cut
down the current flow before it actually reaches the device?
...
- 573
0
votes
0
answers
25
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Do you get correct graph of transfer characteristic, if you take +ive Vds(constant) value instead of -ive. As mostly CNTFETs are p-chnl FET
I'm studying transfer characteristic curve of CNTFET to get value for mobility, S.S, etc. According to my basic background knowledge, NMOS curves lie in the 1st quadrant. While for PMOS they lie in ...
- 11