Recent content by green-fresh

yes this is what i mean. yea exactly this is what i must do and like what i asked: i find after googling about small signal model that i must at AC consider every capacitor as "short circuit" and also the power source so R_L and R_C have two commen point (one at C and one at GRD)so...

hi all i have some questions about a commen emmiter bjt amplifier circuit . if i had this circuit : and i want to find the ripple of voltage in outout : i will use this equation : V_{O(p-p)}=2I_{CQ} (R_L || R_C) but why i put R_L || R_C not R_L || R_C + R_E or how i conclude that...

thank you i think it is solved now .

hello there! I was reading about ohm rule in a MIT physics course and they calculate the resistance of a nested spherical shells like this : and they but the microscopic form of ohm's law which is : J=\sigma_q E and I=A J so I=(4 \pi r^2 ) (\sigma_q E) and E=-\frac{\partial...

yes! I'm sorry you are right could i have an electric field between negative charge and positive charge even if there isn't a space between them . and is it correct that: the direction of this field is,i know from positive to negative , from CB(conduction band) to VB ?

i read in an online course about semiconductors that electric field between E_c and E_v given by: E=\frac{dE_c}{q dx} and i know the general form of electric field is : E=\frac{k.q_0.q}{r^2} and what is the direction of this field ,i know from positive to negative , from E_c to E_v...

yes! thank you very much dlgoff this is what i wanted to hear

thank you dlgoff but i know how to do analyzing using this method but i can't understander the case of connecting the circuit to ground without eletrons going up to circuits and have influence to other voltages

thank you berkeman for this useful informations as what 'what' said: and from this to definitions i can tell you exactly what i mean: when i attach the node to ground i had zero voltage in this node . physically the electrons must go from the smaller voltage point(v_{ground}=0) to the...

in the nodal analysis -one of ways of analysis DC circuit - i couldn't understand the physical roots of this way . i mean how could i make the voltage of a node equal to zero by make it as a reference point without having any effects on the voltage(electric potential) of the rest nodes ...

kote! thank you very much:smile: i think this resource is much better than what i found and i will try to get a book about number and error analysis . Bob S sorry but what is this case is different from: \Deltav/v =\Deltaa/a + \Deltab/b + \Deltac/c where delta a is known delta b is...

hi everyone ! when we say (for example)a,b and c are the dimension of Parallelogram a=2.267+- 0.002 cm b=3.376+-0.001 cm and c=0.207+-0.001 cm dose that means that we used equipment to calculat a and another to calculate b and c ? because i know that delta a or b or c is half...

frequency of what ? of light wave or sound wave ? and about what is this experiment? because i now another way to calculate errors in experiments (with out drawing but in need equation or something like that ).