Tagged Questions

0
votes
2answers
145 views

How does current flow from the emitter, through the base and to the collector in a NPN transistor?

So, I understand that for a NPN transistor to work the emitter-base junction needs to be forward biased and the collector-base junction needs to be reverse biased. I understand how current flows from ...
0
votes
1answer
78 views

If we connect a block of p-type semiconductor only to a positive terminal, will it become positively charged?

Connect the positive terminal of a battery to a piece of p-doped semiconductor, say, silicon doped with boron. Will the terminal pull electrons out of the doped silicon, or equivalently, inject holes ...
0
votes
0answers
66 views

Quantization in room temperature

I can't understand Why is quantized conductance in this scheme ? http://postimage.org/image/4nujpfe7j/
4
votes
1answer
670 views

Why does it spark when I push a plug in the electrical socket?

When I slowly push a plug into the electrical socket I can often see sparks. Can anybody explain why? Can this be possibly harmful for the devices I plug in?
3
votes
2answers
249 views

number of electrons my laptop uses in a second

in order to confirm whether I understand the relation ship between amps, columbs and electrons I decided to try out the following. my laptop adapter's label reads 3.34 amps. I assume that: amps are ...
4
votes
2answers
352 views

lifetime of a PN junction in a diode

diodes are made of silicon, which have been enriched in phosphorus and boron to create the PN junction. Since the electrons are always going in the same direction, from N to P in the junction, I was ...
0
votes
1answer
58 views

Impedance Measurements in AC at Various Frequency [closed]

I need to build a device to measure the impedance in AC, at various frequency (100Hz - 100KHz), with the quadrupole method. No, I have quite a good understanding of the principle behind the this kind ...