Electronics Engineering

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

Transistors are typically operated in one of two (well, four) regions: saturation/cutoff or linear (forward or reverse).

When used as amplifiers, transistors are operated in the linear region. If you look at a transistor's V-I (voltage - current) characteristic, you'll see the linear region is somewhere "in the middle", where there is sufficient voltage applied (so current flows), but not to much (so the transistor is not saturated). To get transistors to operate in this middle region, DC circuits are used to bias the transistor to the center of the linear region. So the transistor is working on both AC (the signal applied to the input that is amplified at the output) and DC (the biasing network to allow the transistor to operate as a linear amplifier).

When used in saturation/cutoff, the transistor is being used as a switch (on/off). this is common in logic devices (gates, arrays, CPUs, etc.). The input to these devices is typically an irregular AC wave (a square wave of information). A power source is needed that is DC, however, to provide the power to drive the output to one state or the other.

So proper transistor operation requires both AC (as the signal) and DC (as the biasing network, or power source).

Resistor is an eletrical and electronical part whose function is to decrease the value of the voltage in a circuit, consequently reducing the value of the current, which is measured in Amperes.

No, some electronic devices use analog signals as their input/output others may use digital signals as their input/output; some equipment uses an analog signal as the input and outputs a digital signal. Be sure to use the correct signal and signal strength otherwise you may damage your electronic device.

a balanced modulator can use any non linear device which has a response of the form:- i=a+ bv + cv2 +..... it generally utilises a push pull FET circuit or a pair of identical diodes. the modulating voltage is tapped in between and with RF in series is fed to both source of FET. the gate of both FET gets AF and RF, AF tapped from either side of secondary coil makes it 180 deg out of phase. the drain outcome is added by which the phase opp carrier cancells leaving sidebands and modulating freq, which also can be filtered with tuned secondary at load.

If you keep all of them in series, then each component in your circuit will have

more voltage across it and more current through it, and will dissipate more

power (heat).

If you keep all of the batteries in parallel, then they must all be rated for the

same voltage. Nothing about the circuit's performance will change, but it'll be

able to operate longer before the batteries die.

Sorry. You cannot convert ohm-cm to Mohms, just like you cannot convert mph to miles. They are two different concepts.

If you also have the thickness of the material (say along the z axis) in question, then you can divide ohm-cm by the thickness to get to ohm per square. In order to convert ohm per square to ohms, you also need to know the number of squares (the x-y plane).

An example. Let us assume a metal ruler of two cm wide (x), one meter long (y), and 0.2 cm thick (z). Let us assume the resistivity of the metal is 1 ohm-cm. Find the resistance of the metal along the length of the ruler (in the y direction).

Resistivity = 1 ohm-cm

Thickness = 0.2 cm.

Sheet resistance = 1 [ohm-cm] / 0.2 [cm] = 5 ohms/square

Number of squares = 1 [m] / 2 [cm] = 50 squares

Total resistance along y = Sheet resistance * number of squares = 250 ohms.

Q.E.D.

P.S. Note that the term, resistivity, is a general property of the metal, no specific design in mind. Resistance is calculated for a specific object (the ruler) made of the metal. "Square" is not one of the SI units, but "Square" and "sheet resistance" are terms used by engineers to describe thin films.

============================

A capacitance meter is a piece of electronic test equipment used to measure capacitors. Depending on the sophistication of the meter, it may simply display the capacitance or it may also measure a number of other parameters such as leakage, equivalent series resistance, and inductance.

Voltage is the product of current times resistance, V=IR, I is Current and R is resistance.

ANSWER: It is a simple ratio of 1:1:1

Yup......But only if u connect them in PARALLEL! Connecting them in parallel (e.g. the positive cap from Battery 1 is connected with the positive cap from battery 2.....the negative cap from battery 1 goes with negative cap from battery 2) adds the amperage (voltage remains the same).......Connecting them in SERIES (as in any flashlight the positive cap of battery 1 goes with the negative cap of battery 2 making a "bigger battery" that has the positive cap from battery 2 and negative cap from battery 1...) adds the voltage (the amperage is the same). Note: Use same batteries either parallel or series connection.

by adding resistance in parallel more current is bound to flow

the important of diode in electrical circuit is to,,flow the current being regulated to the resistance of the electricity ,,from ac to dc..