Engineering - September 2007

2007-09-24 11:32:57 · 2 answers · asked by Arabian 1

It's for my assignment, it's a simple question I know. But, I'm new at phys, lil' help please! .. ..It says, 'Using appropriate precision, perfomr the calculation. Include appropriate unit in answer.

That's all completely over my head. For now.

Thanks!

2007-09-24 11:29:53 · 1 answers · asked by robbi b 1

What the advantages of analog modulation over digital modulation, and what are the disadvantages of anlog modulation?

2007-09-24 11:18:55 · 3 answers · asked by Lems B 1

How many square miles of solar panels would be necessary to power the entire country? If you have supporting information it would be most appreciated.

2007-09-24 11:11:55 · 2 answers · asked by David L 2

2007-09-24 10:48:45 · 5 answers · asked by cumuliform 2

What is the total Resistance of this Circuit.
All Resistors are in Ohms.
And what is the Current flowing through it, also what is the Power dissipation in Watts...?

http://bp3.blogger.com/_3dHP_CJrEXQ/Rvglq_miQfI/AAAAAAAAAAs/HMgoThY5NYc/s1600-h/resistor.jpg
or
http://wwwemcsquared.blogspot.com/

2007-09-24 10:19:44 · 7 answers · asked by Anonymous

Specifically, what materials are used to insulate? And what properties do they have that makes them good insulators?

2007-09-24 10:08:16 · 6 answers · asked by Anonymous

Where do I find a driver that will let me run LED headlights, taillights etc off of a traction system with a pair of 12vdc batteries in series. They aren't big on amp/hours, so incandesents are no good.

2007-09-24 09:47:30 · 3 answers · asked by redscott77092 4

I have a question about electrical grounding. As I understand it, every electrical item found in the home with a metal casing, or copper plumbing, is earthed and is connected together to a rod in the ground. However, what I do not understand is this: this configuration also means that all metal appliances, plumbing, etc, are all linked together, and therefore, if one electrical appliance developed a fault which lead to its metal casing to become live, then surely every other item in the house with a metal casing, plumbing, etc, would also become live? of course, at this point the fuse would blow, or the RCD would kick in. But it would still mean, for a split second, that anything metal is dangerously live in the house, not good if your in a metal bath, or washing dishes in a metal sink? why is this not a problem? or is my understanding wrong?

2007-09-24 09:40:47 · 6 answers · asked by boyinlove2k 2

That is what internal mechanisms initially suck so much current out of the wire that other devices blink and then seemingly require very little energy once they have reched top speed? What about the machine changes when it tansitions from using 6x the operating current to only one times the operating current?

Is it simply a matter of the resistance decreasing as soon as the motor attains its desired speed?

Thanks a lot.

2007-09-24 07:23:03 · 5 answers · asked by wonderer 1

2007-09-24 06:40:46 · 6 answers · asked by Anonymous

I quote this from the wikipedia((Residual current devices)) ((It cannot protect against electric shock where current flows through a person from phase to neutral or phase to phase, for example where a finger touches both live and neutral contacts in a light fitting. It is virtually impossible to provide electrical protection against such shocks as there is no way for a device to differentiate between current flow causing an electrical shock to a person and normal current flow through an appliance)) is it really impossible or our existing knowledge falls short of such acheivment?.

2007-09-24 06:18:00 · 2 answers · asked by moh 1

Can someone help me with this truth table:


H= wx + xy' + wx'z' + xyz' + w'xy'

2007-09-24 06:08:41 · 2 answers · asked by chs_soccer_02 2

An integrated circuit or computer chip consists of a Si wafer with patterns of copper wires attached to the surface. During normal operation the chip may heat up and cause debonding of the Cu wires from the Si surface. This is because:




1. The Si expands more when it is heated

2. The Cu is an electrical conductor and Si is an insulator

3. The Si is a semiconductor

4. The Cu has a higher coefficient of thermal expansion

2007-09-24 05:36:47 · 2 answers · asked by Anonymous

Please answer professionally. This is for my high school assignment.
What is your name, age, and occupation?

My school assignment is to make a fire prevention device that helps prevent house fire. What capabilities do you think this device should have?

Do you have any suggestions on preventing or stopping a house fire?

(Optional) Do you have any suggestion on making this device?

Last question. In your opinion, what is the most important attribute of teamwork?

2007-09-24 04:27:14 · 1 answers · asked by minhnhatx 2

2007-09-24 02:47:28 · 7 answers · asked by romeo d 1

:D

2007-09-24 01:40:27 · 1 answers · asked by Anonymous

I have this little LED flashlight/ radio combo gadget that you recharge by turning a crank on it. Will I still be able to crank it up and work it after and EMP or Nuke strike?

2007-09-24 01:02:53 · 6 answers · asked by booblackle r 2

I'm tutoring some Japanese students on how to write better failure analysis reports and respond to emails in English regarding these reports. To give them some practice I'd like to prep some situations to reply to. I'd appreciate if anyone familiar with this subject could provide me some examples.

2007-09-23 23:24:22 · 3 answers · asked by Sinbad 2

2007-09-23 22:09:00 · 3 answers · asked by Anonymous

My vote - Microwave
My Partners - Hands Free Kit for Mobile

2007-09-23 22:02:09 · 28 answers · asked by Anonymous

2007-09-23 20:09:48 · 3 answers · asked by mr. nice and slow 1

AT89 is a series of microcontrollers made by ATMEL . it belongs to the 8051 family of microcontrollers .
i am using one of the microcontroller of this series and want this databook in ebook format , free of course , so that it can help i my project work .

2007-09-23 20:09:25 · 1 answers · asked by ravi k 1

This learning centre has computer rooms, theatre halls, meeting rooms, and so on. It functions as an engineering multimedia library.

No description is available for "small electrical workshop" so some ideas would be great. THANKS!

2007-09-23 19:27:37 · 2 answers · asked by s3an_looi 1

I have a 1/6 scale dune buggy and i would like to mount it in the back of my 4x4 so i can remove it with the flick of a switch.I would like to use an electromagnet but i dont want to damage the electronics in the RC car.Help!

2007-09-23 18:58:14 · 2 answers · asked by isaacchef 3

2007-09-23 18:52:34 · 1 answers · asked by Anonymous

2007-09-23 16:09:08 · 3 answers · asked by Anonymous

by using gear reduction, could a generator recharge electric car batteries?

2007-09-23 14:44:58 · 2 answers · asked by sparkelcrete 1

if it depends on rate, how so? if the temperature drops in the empty one, by how much?

2007-09-23 14:40:17 · 5 answers · asked by Anonymous

2007-09-23 12:25:40 · 7 answers · asked by naz 1