Engineering - January 2007

Just trying to figure out why I can't find any power supplies (wall warts) that deliver the appropriate voltage? For example went to goodwill looking for a ps that would deliver around 5V and 500 mA, found a couple that said 4.2V or something like that. Got home and checked with Vmeter and found out it was like 7V. Is this just because there is no load on it or what? I'm somewhat new at electronics just trying to figure this out, don't want to have to add a regulator to my project. Thanks in advance.

2007-01-29 18:23:39 · 2 answers · asked by FastEddie 5

2007-01-29 18:20:44 · 4 answers · asked by taniya g 1

2007-01-29 17:41:25 · 4 answers · asked by murali s 1

In terms of material properties, filament length and filament surface area.

2007-01-29 17:17:39 · 1 answers · asked by Josh L 1

hi, I'm not an engineer. i work in a factory which involves hydraulics, pneumatics, conveyors, manual packaging, cooling systems, furnaces. i would like to automate what i can in the factory to lessen the work load of our workers. i would like to know what i can use for automation of machines for improvements, like limit switches, sensors, delay switches, etc. and there functions. it would help me have an idea for designing, and to know whats possible. thank you.

2007-01-29 17:01:22 · 2 answers · asked by well_behaved_guy 1

see if they crumble as on 911

2007-01-29 16:28:18 · 5 answers · asked by shitsueu 1

2007-01-29 15:35:23 · 4 answers · asked by s1us1ang 1

2007-01-29 15:34:27 · 1 answers · asked by lala haha gaga mama 2

2007-01-29 15:09:35 · 6 answers · asked by khan m 1

I'm interested in anything electrical or having to do with muscle. Any suggestions?

2007-01-29 15:07:59 · 5 answers · asked by sharke45 2

2007-01-29 15:03:36 · 4 answers · asked by MOHAMMED K 1

What area would provide the best chance to find a good job? Make the most money? Travel the world?

2007-01-29 14:55:13 · 12 answers · asked by Andrew G 2

2007-01-29 14:54:32 · 1 answers · asked by ixchel 1

I have to build a popsicle bridge for school. It will be tested by hanging a hook with a bucket and filling the bucket with bricks or some other weight. I was wondering if a truss box kinda shaped or an arch would be stronger. Please let me know ASAP.

2007-01-29 14:53:59 · 4 answers · asked by i_need_answers 1

I want to be a structural engineer but I hate to work outside,I want to work in an office with air conditionated.

2007-01-29 14:45:43 · 4 answers · asked by The Apostle 2

Spec required for floating global bid. Tried worldpumps.com, but no success hence the request.

2007-01-29 14:39:09 · 1 answers · asked by sarma k 1

2007-01-29 13:42:54 · 6 answers · asked by san_208 1

please, help! (physics)

2007-01-29 13:06:56 · 3 answers · asked by CHI U 3

a gas sweeting process

2007-01-29 13:04:53 · 6 answers · asked by qazi 1

2007-01-29 12:50:56 · 7 answers · asked by james s 1

2007-01-29 12:47:47 · 1 answers · asked by june d 1

Calculate the standard enthalpy change in kJ for the production of 15.2 g of H2O(g) from a reaction where the reactants and products are:

reactants: H2S (g) O2 (g)

products: H2O(g) SO2 (g)

2007-01-29 12:28:17 · 2 answers · asked by Anonymous

I need a circuit for a constant current source using a 1.5v battery and a DC poswer supply.

2007-01-29 11:56:26 · 2 answers · asked by Sparky 2

I am interested in aerodynamics and engineering aircraft, but I don't have many informational resources readily avaliable to turn to. Can anybody help me please? Thanks, it is greatly appreciated!

2007-01-29 11:43:12 · 5 answers · asked by Sir Issac Newton 1

I need a simple circuit to drain a 1.5 volt alkaline battery at a using a current of 50mA.

2007-01-29 11:37:24 · 4 answers · asked by Sparky 2

2007-01-29 11:30:02 · 3 answers · asked by Sudheesh V 1

Are they not efficient enough?

2007-01-29 11:00:21 · 4 answers · asked by Ejsenstejn 2

It seems that everything is going wireless these days by using radio and infrared communication. Bluetooth is being put into most portable electronics,everyone including kindergarteners carry cell phones, laptops are all wi-fi ready, wireless mice and keyboards are sitting untethered on people's desks, but we are all still plugged in to the wall. (I know laptops break free from time to time, but as they get older, they tend to get plugged in more often.)

Will we see wireless transmission of power to our appliances any time soon? I realize that this has been done over very short distances, like rechargeable toothbrushes and recharging pads for portable electronics, but I want to know for distances from 1-50 feet. Or would it be too dangerous to have such huge quantities of power floating through the air? If we used directed energy, would people get fried it they crossed the beam? What do you think?

2007-01-29 10:28:19 · 6 answers · asked by Kyle 2

2007-01-29 09:31:01 · 6 answers · asked by specialtrv 1

it does not seem to have enough power coming from it. Its a single phase 220v 20kva generator. That should give me about 80amps. Now I'm thinking that there are two outlets..... does this mean that the ampage is split between each ? 40amps each ?

2007-01-29 09:06:53 · 7 answers · asked by Anonymous