Electronics Engineering

1. Compressor

2.A fan

3.A gas, like freon, which vapourises @ a temp lower than room temp

4.The tubing/Piping

An AC is a heat transfer operation.The gas(in the form of a liquid) travels through the piping and it evaporates very quickly cooling the tube.The fan blows air across the tubes into the room, now to turn back the evaporated gas into a liquid so that it can be evaporated again, it is led into the compressor, the compressor is basically a mechanical component, which squeezes the gas back into liquid so that it can be evaporated again, this happens continously, and during compression, a lot of heat is generated, which is thrown into the outside atmosphere.This is the basic working of any refrigating device.

The wavelength of a signal at 89.10 MHz is 3.37 meters.

Divide the speed of light, which is about 300,000,000 meters per second, by 8,910,000.

PN junction: putting a P-type material next to N-type material to form the PN junction.

P-type is where you have more "holes"; N-type is where you have more electrons in the material. Initially, when you put them together to form a junction, holes near the junction tends to "move" across to the N-region, while the electrons in the N-region drift across to the p-region to "fill" some holes. This current will quickly stop as the potential barrier is built up by the migrated charges. So in steady state no current flows.

Then now when you put a potential different across the terminals you have two cases:

1. +ve end to P-type, -ve end to N-type: The electric field from the external potential different can easily overcome the small internal field (in the so-called depletion region, created by the initial drifting of charges): usually anything bigger than 0.6V would be enough. The external field then attracts more e- to flow from n-region to p-region and more holes from p-region to n-region and you have a forward biased situation. the diode is ON.

2. +ve end to N-type, -ve end to P-type: in this case the external field pushes e- back to the n-region while more holes into the p-region, as a result you get no current flow. Only the small number of thermally released minority carriers (holes in the n-type region and e- in the p-type region) will be able to cross the junction and form a very small current, but for all practical purposes, this can be ignored.

of course if the reverse biased potential is large enough you get avalanche break down and current flow in the opposite direction. In many cases, except for Zener diodes, you most likely will destroy the diode.

Advantages: it improves frequency stability.

phase modulation n demodulation is easy as compared to frequency modulation.

Always voltage constant in parallel circuit if you look your house wiring all are in parallel therefore 220 volt present in every house but current is different

Yes, in accordance with Ohms law.

Accross a given resistance, current will increase directly proportional to the increase in Voltage.

Voltage(Volts) = Current (in Amps)x Resistance(in Ohms)

You can transpose the formula to find the unknown, given 2 of the values.

pp

you can use the R motor from a hard drive. note this motors don't work for testing current.

The fractional change due to intensity on minority charge carriers is more than on majority charge carriers. When light is directly polarized it acts like a normal diode but when reverse polarized its current depends on the brightness (intensity of incident light).

The most popular electronic will be Iphone & Ipad

The NOT gate is also called an "inverter", as its output is always the complement of the input. That is, if the input is TRUE then the output is FALSE else the output is TRUE end if). Its implementation electronically is not much different than that of an analog inverting amplifier, except that the gate is deliberately designed to operate nonlinear and change rapidly from one state to another.

A diode is a "one-way valve" that allows electrical current to flow in only one direction. A diode placed in series between an AC voltage source and a resistive load will allow current to flow through the load in one direction and block the current when the polarity of the AC voltage changes.

scattering, costs high than wireless communication, difficult to maintain,splicing should be perfectly taken care ,otherwise the loses increases in the optic fibres

By connecting collector to base, you get a *lower* forward voltage drop than with a simple diode.

Example: germanium diode-connected transistor has a drop of about 0.13 volts, rectifier diode about 0.3 (over 2.5 times)

It's just that rectifiers are optimised for rectification, are designed to work at (generally) higher currents, and are cheaper.

This circuit can switch on and off light a fan or a radio etc;by the sound of a clap This circuit is constructed using basic electronic component like resistor transistor relay transformer capacitor .This circuit turns on light for the first clap . the light turns on till the next clap .for the next clap turns off this circuit works with 12v voltage . therefore a step-cown transformer 12v/300ma is employed. The working of the circuit is based on amplifying nature of the transistor . switching the nature of transistor and relay as an electronic switch.

A transistor

For one thing, lasers need a significant amount of power. And like any optical-based communication medium (like LiFi or IR), it's only effective if you point it at the recipient and if the recipient is facing you - whereas electromagnetic radio wave technology no matter where you are or where you're facing you will still get the signal.

The symbol for a relay is in two parts, and it's rather difficult and ineffective to describe verbally. Therefore, I added a direct link to an image of the accepted symbol to the "Related Links" section.

The best way is to use an EM solver, such as FastCap from MIT. Numerous published papers also describe the best-fit formulae to calculate fringing capacitances by hand. Try reading "Modeling of interconnect capacitance, delay , and crosstalk in VLSI," by Wong et al., IEEE Trans. Semi. Manufacturing, v13, n1, February 2000, pp108, and the references therein.

• DC is constant in direction
• AC is reversing in direction

A circuit in which electricity only flows in one path is called a series circuit.

"http://wiki.answers.com/Q/How_are_a_magnets_magnetic_force_and_magnetic_field_different"

A motor vehicle's power is measured traditionally in horsepower or BHP as in Break Horse Power eg. the porshe carrera's engine output is 400BHP.This is not a fact but merely hypothetical since I do not no the actual BHP of a Porsche carrera. I Hope this has answered anyone's curiosty.