Electronics Engineering

There are two primary uses of a capacitor in the biasing of a transistor.

One is to isolate the DC component of the input or output signal from the input or output of the transistor. This is often done in audio applications where the input signal is centered around ground reference, but the base is biased at 0.7 volts. Similarly, the collector is biased away from ground, but the signal needs to be shifted back to ground reference.

The second is to change the gain as a function of frequency. Depending on where the capacitor is located in the circuit, the capacitative reactance as a function of frequency can add to or subtract from the bias point and/or gain of the circuit. Usually, this capacitor would be located on output side, along with the emitter or collector resistors.

India's is 765 kV.

For the flow of Electric Current, the material must contain free electrons.

If there are no free electrons, then to conduct electricity the applied voltage must exceed breakdown voltage.

Plastics under ordinary state does not have free electrons but if high voltage is applied then it can start conducting.

quantisation noise decrease and quantization density remain same.

leaning in one direction or another

resistor

Its a very difficult subject to which most of my fellow designers estimate the ripple current in the caps and then select capacitors that can handle that current. The idea of voltage droop om most DC links can be forgotten because of other compensators such as a lower BEMF motor. The problem is to get as much life out of the caps as you can and that's to keep them cool as you can. Assume that every amp delivered from the DC like is an amp of ripple current and you should be OK.

Low power factor means higher than necessary load currents. These require unnecessary expenditure on the amount of copper in supply equipment such as cables, transformers, and switchgear. Higher than necessary load currents also mean greater voltage drops and poorer voltage regulation.

It decreases by a factor of 4

Material that makes up the wire, length of wire, diameter of wire, and temperature of wire

208 v three-phase supplies are an option for American properties, because the line to neutral voltage is 120 v.

A dynamo flashlight works by producing its own electricity. The flashlight has a crank that is turned by the operator. The crank runs a small generator inside that produces enough electric to run the flashlight.

Silicon is useful as a base to build electronic components on because it has all the valence electrons it wants (4). A diode is created by placing a an element with an "extra" valence electron near an element that wants an "extra" valence electron.

For power factor improvement so that the KVA demand is reduced.

Electronic configuration is a term used in atomic physics and quantum chemistry. This is the manner in which electrons of a specific atom or molecule are distributed in an atomic or molecular orbital.

I believe the internet helps us communicate far better than we did 20years ago. An example of mine is where a friend is the other side of the world(Australia) and we communicate to her almost evreyday(via facebook,MSN and other messageing websites as such.

Generally most A.C motors that most people see regularly have no commutator (though not all) ,so there is sometimes less mechanical frictional losses this can increase overall efficiency.

This usually means less parts to fail.

Some A.C motors require ¨start¨ and or ¨run¨ capacitors and may also require a start mechanism that will have frictional losses and add to the bits that could fail.

They also often have detrimental magnetic eddies which cause some losses, this is often due to economical stator or rotor construction.

A.C motors can have a very high power density as the magnetic flux is generated with an A.C current this can be higher than most conventional D.C. motors especially due to the high rate of change of current through the stator and rotor.

This is the very nature of the A.C current it is constantly changing.

D.C motors are often made using permanent magnets (again not always) so they can ¨get something for nothing¨ so to speak with an existing magnetic field. Energy does not have to be wasted to create one of the required magnetic fields to make the motor rotate.

D.C. motors can be made without permanent magnets too. Some of these motors can also have very high energy densities as the current can be made to change very rapidly either with the commutator or with special drivers.

There are very few hard and fast rules about A.C versus D.C in motors as both types have been extensively developed over many years.

The decision to use an AC or D.C motor usually come down to what is available to drive the motor in question.

Cars use D.C. as they have a D.C battery.

Washing machines and fridges use A.C as it is generally more efficient to send A.C over long distances to your home.

It is also currently far easier to convert A.C up and down through transformers etc, The transmission and distribution of D.C is far less efficient and more complex so this often dictates our choice rather than the motor type.

Use Ohm's Law, i.e.,

V=IR

here, V=voltage

I=current

R=resistance

Rectangular Waveguide - TE10; (TM11 in case of TM waves)

Circular Waveguide - TE11;

Type your answer here... to properly bias the junction for current flow thru the transistor. The voltage potential must be different on the base than the collector

Disadvantage:Easy to damage when compared to BJT