Electronics Engineering

i neeed help and this answer is not helping me at all

* Lights. * Appliances. * Heating/air conditioning. * Security systems. * Traffic control.

both but for analog usually a frequency Carrier is required

Semiconductors aren't built, they are chemicals. Maybe you are thinking of semiconductor electronic components.

The first semiconductor discovered was galena (lead sulfide) which was first used in a practical electronic component in 1874. The next semiconductor discovered was copper oxide which was first used in a practical electronic component in 1924. After that many others were discovered including selenium, germanium, and silicon.

It was not practical to build electronic components using silicon until 1958 when Fairchild perfected their silicon mesa process, then in 1959 their silicon planar process.

Power Surge

capacitor, inductor, resistor..

Ib =Ic /beta beta is the gain factor of the amp.

That would depend on your application. If there was a singke best way, that would be the only method used.

The picture quality is not that great but here is a drawing of a self biased common collector BJT

http://imageshack.us/photo/my-images/200/selfbiasedcommoncollect.png/

half of the current flowing thru resistor 1....

V=IR.

Fifty millionths of a farad, abbreviated as 50 uF. Farad is the unit of capacitance. 50 microamps DC flowing for 1 second will charge a 50 uF capacitor to 1 volt.

Set-top- box signal

Do you mean transistor?

A transistor is a small low-powered solid-state electronic device, consisting of a semi conductor and at least three electrodes: emitter, base and collector.

Fiifi Krampah.

They are able to see where all the planes are. They can guide the pilots of the planes and tell them where to land and when to. They can tell them when the air is really busy, and when there is no one in the air.

It is a waveguide that is circular. Circular waveguides have modes that are described in terms of Bessel functions instead of the sines/cosines used for rectangular waveguides. The disadvantage is that the two lowest modes have cutoff frequencies spaced by less than an octave. Circular waveguides are used for rotating joints, for example in radar.

The H01 mode in circular waveguide was used as a low-loss mode for transmitting signals over distance, but this technique has been replaced by fibre-optic cables.

Ya....I just got one..

It is mainly implemented in error detection and correction.

It is used for performing modulo arithmetic.

That depends on what kind of a system the local oscillator is part of. In a simple AM receiver, it's typically 455 KHz above the frequency of the incoming signal of interest. In a consumer FM radio, that figure is 10.7 MHz above. In a 'legacy' analog microwave receiver, it's almost always spaced 70 MHz from the received carrier, and since the ubiquitous advent of split-mount digital microwave equipment, with the RF system clamped to the antenna, there's no telling any more ... you always have to look in the book (if that information is even included in the book).

Oscilloscopes are a electronic device used to measure signal voltages. There are useful to mesaure any flucuations in voltages from most modern electronic equipment such as computer power supplies for example. They are mostly freely available from major electronics stores however if you are looking at keeping the cost low by buying a second hand model then most popular auction sites should have a few listed.

auto parts store

it measures the voltage of the battery and has a load of a reasonable size

so voltage has some correlation to charge state.

when batteries had external posts you could check them one cell ata time and know which cells to add water to

now to test battery a cell at at time youll need to get a hygrometer theres one with assorted plastic balls of different densitys. about $1 and much better than electric test .

there are some batteries now that are sealed so throw those away if the auto parts place wont give you $5 for it

for a 9volt battery lil bity one you can get one at radio shack

this can also check cells, has load resistors for AAA AA C and D.

The diode that has a negative resistance region in its voltage-current curve.

electrolytic capactior

for the insulation purpose.

That really depends on the damages of the music player. If it is still recognized when you plug it into your computer, it is likely that you can recover the music. But if it is not recognized, you probably won't be able to recover it on your own.