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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
How do you disable the red exit alarm door alarm so it wont go off when you open the door?
Put the key in the alarm disable lock and turn.
There are two types of door systems. One as above, which is a free standing door system and the other where the door is tied into the buildings alarm system. In both cases the person that looks after the buildings security has to be notified. They will use a key that they keep and disarm the door for you. This security person also has the ability to lock the door alarm out of the buildings security system if that is the type of system used. Usually you have to sign a paper as to why the door open request was made and when you finish the time the door was brought back on line.
Do all black berry phones half to have a data package?
No, you can just buy the phone buy itself but it will be more expensive, plus you'd have to pay an extra £5 a month for blackberry messenger (BBM) and other blackberry services, but only if you want it. Mine is on contract but i barely ever use blackberry messenger, just use my internet, texts and minutes lol :)
Why do you need to have a sim card to activate an iPhone?
Iphone uses sim cards to track the user and gets all hidden information from them
What happened if you connect 230V to secondary of transformer whose voltage rating is 230V to 18V?
if you drove the 18V winding with 230V the transformer would burn out, if it didn't catch fire first
The Bus Bar is (usually 3, or 4) solid copper bars that run through an MCC (Motor Control Center) and just supply power to the individual 'buckets' (compartments that contain the individual motor starters).
The only protection for a bus bar would be from the 'Panelboard', or 'Switchboard' breaker that feeds the bus bar mounted in a separate MCC.
Make Sense???, let me know if not...
Can electromagnetic fields make you feel paranoid or other symptoms?
well not all people are so sensitive to this exposures and have no affect at all, but yeah some people may feel like their being watched, feel paranoid, or may feel sick from your stomach. I still dont know why some people are not affected by high EMF (electromagnetic feilds) (info from ghost hunters and world encyclopedia)
How long do wind turbines last for?
The turbine companies generally claim 20 to 25 years. Recent studies have shown that the life span is probably more likely to be around 10 to 12 years.
This is due to the electronics within the turbine itself.
Most electronics are build to last for 10 years as after this time it is thought they will be obsolete (which in most cases is probably true).
The wind turbines electronics are no different, while the blades and outside may well be build to last for a far longer time, the components are build to standard electronic component levels and are generally not build to last longer than the average 10 years (that's not to say that in some cases they wont though).
So there is a fair possibility that after 10 or so years the complete inside of a wind turbine will need replaced, effectively meaning the whole wind turbine will need replaced.
Functions & Features • Monitoring two DC input signals and transmitting an output signal proportional to the higher or lower input • Universal power input • High-density mounting Typical Applications • Selecting greater flow, pressure, etc. for control • Heating control based on the highest temperature among several T/C's on a furnace Regards Rajesh.R sjcraju@gmail.com
Space born radar is radar located on a space vehicle, often term a non air breather. Implementation of Synthetic Aperture Radar (SAR) and Inverse SAR (ISAR) are common
A: absolutely not lamps needs current a long cord introduce IXR drop making less current for the lamp to use it
The total current flowing in the three resistors,
i = 110 V / r(eq); where r(eq) is the equivalent resistance of the three parallel resistors.
r(eq) = 1/[(1/20) + (1/60) + (1/80)] = 1 / 0.079 ohms = 12.63 ohms.
i = 110 V / 12.63 ohms = 8.71 amps.
When was boolean logic invented?
I believe it was in the 1840's but George Boole the inventor of Boolean Logic lived from1815 - 1864
a high power, often class C amplifier.
Are tungusten and platinum conducts electricity?
All metals will have plenty of electrons in conduction band. Hence Tungston and Platinum are good conductors of electricity as they are metals.
S.Lakshminarayana.
Draw the circuit diagram of miller sweep generator?
No. I don't need one. Nor is it possible on WikiAnswers.
What is a 60 Watt CO2 Laser Cutter?
The 60 watt CO2 laser source is categorized as a low power CO2 laser. It is capable of laser cutting nonmetals including acrylic, woods, paper, textiles, and more. The laser machine as a 60 watt CO2 laser cutter/engraver is a very popular size for use by small shops for point of purchase displays, trophies, signs, crafts, and more. Larger companies employ it for prototyping and limited production. See answers to more common laser machine questions at 2laser dot com.
The resistance and reactance of an a.c. load are determined from the phasor diagram for that load. A phasor diagram is very similar to vector diagram, and represents the voltage drop across the resistive component of the load as being in phase with the load current, and the voltage drop across the reactive component as lagging the load current by 90 degrees. The vector sum of these two voltage drops will equal the value and phase-relationship of the supply voltage.
If we now divide each of these three voltages by the supply current, we will converted the phasor diagram into what is called an 'impedance triangle', in which the resistance is represented horizontally, the reactance is represented vertically, and the impedance is represented by the resulting hypotenuse. So, to find the hypotenuse (i.e. the impedance) we must use Pythagoras's Theorem to vectorially-add the horizontal (resistance) and vertical (reactance) components.
What is a replacement diode for 1N5399 since this diode is now obsolete?
You can get them from EBAY
http://www.ebay.com/itm/20-GW-Good-Work-Rectifier-IN5399-Diode-RoHS-Free-/390062236202
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You can get them from ebay but you would be paying 50 cents for a 4 cents device plus shipping. which in my humble opinion is a ripoff.
Farnell still sells this device for GBR 0.03p (4 Cents).
or you could substitute it with something like the CR1-100
Why do some electronic circuits need negative voltages?
Because , in some cases for a negative voltage the circuit components will be biased .
Why use dc motor not stepper motor in robot?
DC motors use PWM (pulse width modulation), which can easily increase or decrease the power to the motor, thereby increasing or decreasing the motor speed by modulating the width of the pulse. Stepper motors have fixed frequencies, thereby having fixed motor speeds. As a result, the speed of the stepper motor cannot be controlled when the load is increased.
How many states do electrical circuits on an IC integrated circuit have?
Not possible to say without knowing much more. In analog circuits every signal has an infinite continuum of states. In digital circuits every signal usually has two states (some digital circuits have been built with three states), but there may be many many billions of these signals (e.g. 21,000,000,000 is an awful lot of states).
The most common and cheapest is a fluid you can buy and paint it over the suspected crack which then shows up in outline. The other methods all employ X-ray or similar and are not generally available to the individual.
