The physics tag has no wiki summary.
4
votes
3answers
123 views
How does a dual gate MOSFET reduce Miller effect?
How does a dual gate MOSFET reduce Miller effect? I am trying to gain a global understaning of the physics behind them, not necessarily exact formula's that come with it other than maybe some for ...
-9
votes
0answers
56 views
Why no positronics? [closed]
The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1e, a spin of ½, and has the same mass as an electron. When a ...
-7
votes
1answer
76 views
Does the anticircuit exist? [closed]
Are there anticircuits like antmatter? Maybe poles are reversed and condensors become resistors and everything else is reverse. I wonder if so if one day things that suck power like heaters might ...
-3
votes
2answers
184 views
Two spheres capacitors
A capacitor consisting of two concentric spheres of radius R1 and R2 = 2.50·R1 has a capacitance of C = 6.00 picoFarads and is charged to a potential difference of 74.0 Volts.
Calculate the energy ...
2
votes
1answer
134 views
Physics/chemistry understanding of PMOS and NMOS to form CMOS
Can anyone provide me explanations or links that provide a clear explanation of what atoms/molecules are in p-type and n-type (PMOS/NMOS) and how they interact to create actions?
6
votes
1answer
2k views
What is the difference between emitter and collector for BJTs?
the (surely simplistic) model of a bipolar junction transistor one is taught in foundational physics course appears to be symmetric. - So, what is the difference between the collector and the emitter ...
3
votes
3answers
237 views
Electro Optics vs Optoelectronics > What's the difference?
I've seen both wikipedias of Electro Optics & Optoelectronics but I'm still confused on what the difference is.
I'm currently pursuing a degree in either Physics or Electrical Engineering because ...
-1
votes
2answers
125 views
Charge moves if you scuff the rag with your shoes [closed]
Why is that when you scuff with your shoes on, charges move (since electrometer moves back and forth), but if you dont have your shoes on, the electrometer doesnt move
Here is the corresponding video ...
1
vote
1answer
119 views
Help with connecting electromagnet to dimmer
I have an electromagnetic powered off a AA battery. Is there some kind of dimmer switch or similar item that would allow me to control the amount of power going to the electromagnet?
10
votes
1answer
825 views
How does a nine volt battery make a spark?
With a nine volt battery, touching the two terminals together (or using a faulty terminal) will cause a spark roughly where I would want it to be.
How is this possible? Is it ionizing only a very ...
3
votes
1answer
120 views
Creation of Trap Levels in Band Gap Energy
When I started reading about basics of semiconductors, I read that no electron is present in the band gap energy and it is a sort of forbidden area for them.
But just now I read that some trap levels ...
2
votes
3answers
288 views
Why can you use an LED below voltage?
If you put too little voltage across an LED, nothing happens, as I would expect. However, I've seen a demo where a red LED is powered with a 1.5V cell, and it lights. I assumee that red LEDs are ...
4
votes
3answers
2k views
How do BJT transistors work in a saturated state?
This is what I know about NPN BJTs (Bipolar Junction Transistors):
The Base-Emitter current is amplified HFE times at Collector-Emitter, so that Ice = Ibe * HFE
...
10
votes
7answers
663 views
Which everyday components involve flows of charge that are not electrons?
I like this explanation of why there's nothing wrong with conventional current being the opposite direction from electron current. It mentions batteries and fluorescent bulbs as two cases where the ...
2
votes
1answer
113 views
Bonding in intrinsic semi-conductors
In the intrinsic semi-conductors,the electrons are bonded by covalent bonds to the nearby electron,when we do doping the electrons make bond with the atom we doped,so the covalent bonds between the ...
