Answer / techyjohn

1- to rectify an AC voltage into a DC one, such as for an alternator output

2- (zener diode) to provide a reference voltage, such as for regulating the field current for an alternator.

3- (variactor diode) to provide an adjustable capacitance which can be adjusted by a DC voltage, such as for tuning radio stations

Diode equation:

The diode equation gives an expression for the current through a diode as a function of voltage. The Ideal Diode Law, expressed as:

I=I0((e^qv/kt)-1)

where:
I = the net current flowing through the diode;
I0 = "dark saturation current", the diode leakage current density in the absence of light;
V = applied voltage across the terminals of the diode;
q = absolute value of electron charge;
k = Boltzmann's constant; and
T = absolute temperature (K).

The "dark saturation current" (I0) is an extremely important parameter which differentiates one diode from another. I0 is a measure of the recombination in a device. A diode with a larger recombination will have a larger I0.

Note that:

I0 increases as T increases; and
I0 decreases as material quality increases.
At 300K, kT/q = 25.85 mV, the "thermal voltage"

Answer / yogesh kumar

diode is use in any case.
1.power controlar
2.power measurement

What is mean by R, Y, B, Bk in wiring???

1 Answers  

---

Explain how to calculate the rectangle of conductor of different sizes?

0 Answers  

---

What is The Difference B/w Routine Backup & Quaterly Backup of switch

1 Answers   HCL,

---

what is call flow!

0 Answers   Ericsson,

---

i)if we use f.m for video signals in t.v. what will happen?

3 Answers  

---

how do link aT1 from the 1st BTS to 2nd BTS4?

0 Answers   Ericsson,

---

why we use vsb transmission for video signal transmission and why dont we use ssb transmission?

6 Answers  

---

What is the main drawback of a dual slope adc?

0 Answers  

---

why do we conduct the campus interviews?

4 Answers   Infosys,

---

highest voltage gain can be obtained from a ).CC b).CE c).CB d).Both CE and CB

14 Answers   Cisco, Ericsson, SRC,

---

sample & previous year papers of sta & je (electronics 0

0 Answers   DMRC, Infosys,

---

when should i deploy fibre channel instead of iscsi?

2 Answers  

---