Recent content by Godwin Kessy

This was the way out to understand, why are hubs half-duplex... Incase it is not clear to you guyz...

I believe full duplex is possible due to separate send and receive cables, and not whether the repeater broadcasts any income signal, So, can we discuss this, I want to agree to my self that if you connect a send and receive cable to the hub, then the hub takes care of the send alone, and...

Ahaa.. I think am getting you even better... Of course the concept is from one of the lectures, that the question-attachment i have posted was solved. And it was like this, Using the superimposition theorem, the dc and ac voltage across the diode was calculated as follows. With the dc equivalent...

Nascent.. I think am getting you, for the new reading am supposed to replace the diode with a different resistor, not 9 ohms as before, it's gone be (0.72+0.015)/(0.08+0.01)=8.167ohms Okay.. And we have this concept.. total dynamic resistance, which is bulk resistance plus the dynamic...

Guys can you please view the image I have attached! Isn't one graph the approximation of the other? and why? Okay, leave alone that, for pure resistors, their resistances doesn't depend on whether the applied voltage is ac or dc. Why is it for diodes??

Okay, the value of the resistance, will be equal to 0.72V/0.08A=9 Ohms... And this is what is the Static resistance of the diode i get it.. Isn't it?

Hellow guys! I find this concept really confusing, if the bulk resistance of a diode is an approximation of the I-V characteristic curve for a diode, Why then is that bulk resistance compared to ac resistances of the same diode at a particular operating in calculated values, seem not to...

How am i supposed to do it.. Just attaching??

sorry the battery is -9V..

How can i insert a picture.. I have just uploaded the schematic diagram as attachment.. Is it going to work??

There it is man... Than you!

Am doing a project that has to use a transistor, as a switch, actually switching a 12V relay switch, that is actually responsible for switching another circuit, but as a result the relay doesn't switch ON, but makes noise continuously, in this clearly certain that the voltage across the relay is...

Okay.. thanks guys, but why we find that the dc resistance is not even an approximate of the ac resistance, from the graph and derivation it's clear that, we use some approximation with DC(Assuming straight line instead of a curve), but for AC we even utilize calculus, these values where...

It's the graph that, approximated the diode as a switch, plus a resistor, which assumes the diode to be an open circuit until the voltage across is above the knee voltage... And at this voltage greater than the knee voltage... the diode acts as a normal resistance( the one called bulk...

Hello... The concept that resistance can be for a dc supply only and not for the ac supply coupled or superimposed to the same circuit, is something i don't understand to this moment... I first realized this in diode systems... where i saw bulk resistance for DC and dynamic resistance for AC...