What is Device: Definition and 530 Discussions

CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems. It is a special ASCII text file that contains user-accessible setup or configuration directives evaluated by the operating system's DOS BIOS (typically residing in IBMBIO.COM or IO.SYS) during boot. CONFIG.SYS was introduced with DOS 2.0.

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  1. jegues

    Another non-linear device question

    Homework Statement See figure. Homework Equations The Attempt at a Solution I tried KVL (see figure), but still got stuck with only 1 equation and two unknowns. Any ideas/tips on what I should try next?
  2. jegues

    What is the solution to the non-linear device problem?

    Homework Statement See figure Homework Equations The Attempt at a Solution Again, see figure I tried something and it looked promising but the answer doesn't work out. Any ideas?
  3. H

    Will this power supply work for my device?

    Will this power supply work for my device? URGENT! I have a Mini-fridge I need to get usable again. Recently, as of a few minutes ago, I opened up its power adapter to find that capacitors have burst and that would be the reason of the fridges death a few months ago. Given the mini-fridge is...
  4. A

    Measuring Flow Rate in a Pipe with a Venturi Device

    Homework Statement Describe how a venturi device for measuring the flow of water in a pope works and estimate the slowest flow rate such a device could be expected to measure using 20% of cross sectional area constriction and a mercury manometer. Homework Equations A1V1=A2V2 I also know...
  5. J

    Designing a GPS Device with Optimal Connectivity for Indoor and Outdoor Use

    "GPS" device & connections Instead of using the satellites like Google Maps, is it possible to come up with a device that any device, such as mobile and laptops can connect and communicate with the device? In other words, let say Harvard campus. We know its campus is very large in terms of...
  6. C

    How does an adjustable device work?

    hello everyone i am doing my intern and am told to come up with a design for a device adjustable in height and width. i have been looking on the internet and found some designs that might work but the problem is i don't know exactly how does they function. for example this design ...
  7. Q

    Residual-current device & isolation transformer

    Hi guys, I don't understand why when one touches both the live wire and neutral wire in the secondary of an isolation transformer, the current in the live wire and the neutral wire in the primary will be the same. This is described in my book as the reason why a residual-current device in the...
  8. M

    XBee Communication For Flying Device

    I am currently working on a project that will be a flying device, so i require a bit of range for control. I have been looking around for control systems, and have come across the XBee-PRO 802.15.4 RF Modem, which seems to me to be the best solution for me. Has anyone used this device before? If...
  9. H

    Lighting Avoidance Device Question

    Hey guys, Earlier this week in my meteorology class we learned a lot about lightening. Basically we discussed how the lower clouds in the storm are heavily negatively charged, and when lightning strikes the ground it is looking for a positively charged area to strike upon due to the fact that...
  10. J

    How many electrons flow through this device?

    Homework Statement An electric device delivers a current of 2.44 A for 55.0 seconds. How many electrons flow through this device? Homework Equations The Attempt at a Solution I am clueless, i need help
  11. L

    Current controlled device

    what can i do with a current source from 5ua to 270ua if i want some sort of active digital components
  12. M

    Designing a Device for Catching Eggs Dropped from Various Heights

    Device that catches an egg! We have a physics project. We are droping an egg from 9.91 meters. We have to use a device that will catch an egg from that height. We can use anything that we want to use to catch the egg. I am trying to get the least height. What materials should we use or...
  13. A

    Need help making a simple flashing LED device

    I'm sure this is very simple for everyone here. I need to make a device that will allow an LED to flash at very specific rates (for example 4 times/sec). I assume I need to use an I/O system that will allow me to program it via computer connected by USB. If this is even the best way to go...
  14. R

    USB Details as shown by Device Manager?

    I have six usb ports in all on my system. 2 in the front and 4 at the back. Now if I go into device manager (in windows xp professional sp2) and check under "Universal Serial Bus Controller" I get the following:- Intel(R) 82801 EB Universal Host Controller - 24D2 Intel(R) 82801 EB...
  15. S

    Grounding Considerations for Portable Radio Devices

    Hi, Some of the ICs for a portable device I'm making need to be attached to ground. However, the device needs to be wireless so I can't ground it the way we usually do. Is there any way around this, such as a circuit that could somehow act as ground? Thanks.
  16. S

    How can I build a simple Wells Turbine for my OWC wave power plant model?

    Hi everyone, I am student of Ocean Engineering and now I am in process designing a model of wave power plant based on OWC. For that, I need Wells turbine for generator. I don't have many experiences in electricity engineering so do anyone have diagram to build simple Wells Turbine ? Thanks...
  17. I

    Find Non-linear Current Across a Device

    I was just thinking about this the other day... Given any 'blackbox' circuit, for which the values of the thevenin voltage and thevenin resistance are known. And given that a non-linear device is placed across the terminals of the circuit. What relation would one use to find the current...
  18. OmCheeto

    Is the HAARP device actually a make people stupid weapon?

    I'm don't think these people were joking when they wrote this article: The article is filled with claims like this from all over: If it is a make people stupid weapon, it seems to be working quite well.
  19. Y

    Locate a servo or similar device

    Hey guys...i'm trying to locate a servo or similar device that has just three basic stipulations... It needs to: -Be able to turn a thin 6 inch diameter plastic wheel (negligible weight, no resistance as it's not attached to anything but the servo) -Complete at least a half revolution in...
  20. P

    Having trouble deflecting charged microparticles in a nanoscale device

    hey guys i am trying to deflect charged microparticles inside a tubed device... the device looks like a horizontal Y... the microparticle solution in DI water is sent through the base of the Y...and i am trying to deflect them to either one of the two branches at the other end totally... i...
  21. U

    Reverse polarities by a device

    There is nothing I have tell before I go about on this madcap search. The problem is that I'm only 12 and searching for a device (or a circuit) which changes, or swaps, polarities, every time the switch (a switch made from a phototransistor and a resistor, in essence, getting activated...
  22. Y

    Solving DAQ Freeze Issues with Fail-Safe Alarm Device

    I'll try to keep this concise. I am trying to build a alarm system for the DAQ system in my lab that will be software (LabVIEW) based and will replace the current hardware tripped alarms. Right now I am working on a final fail-safe alarm to protect against the freezing of the "alarm server"...
  23. F

    What is the most efficient and powerful way to store energy?

    What is the most powerful battery or way to store energy? I have an idea but I wanted to see what you guys would say :)
  24. R

    Closed system piston cylinder device problem

    Homework Statement A closed system comprising a cylinder and frictionless piston contains 1kg of a perfect gas of which molecular mass is 26. The piston is loaded so that the pressure is constant at 200kPa. Heat is supplied causing the gas to expand from 0.5m^3 to 1m^3. Calculate heat...
  25. B

    A piston-cylinder device contains 0.05 m3 of water at 200kPa and 25ºC

    [b]1. Homework Statement A piston-cylinder device contains 0.05 m3 of water at 200kPa and 25ºC. The cross sectional area of the piston is 0.25 m2. Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m3 the piston reaches a linear...
  26. S

    Small, Lightweight Voltage Measurement Device for PC via USB

    I'm looking for a device I can use to measure analog voltage (up to 25V) and send the data to a PC via USB. Only really need one input, though it wouldn't hurt to have more. My main concern is that it needs to be pretty small and light - any ideas? The few I've seen online are either too...
  27. N

    What sort of motor is used in the lead retraction device in my vacuum cleaner?

    The model is a vampyr 731i electronic I can't find the technical information online Howstuffworks.com only gives the information that the fan motor is electrical What sort of motor is used in the lead retraction device?
  28. M

    Engineering Failed Device - What Circuit Fault is Indicated and Where?

    Homework Statement Four devices are connected in series across a voltage source of 120V. The total circuit current is 4.5A. One device fails to operate. The voltage across each of the other devices is 40V. What circuit fault is indicated and where? Homework Equations E=IR I=E/R...
  29. E

    Building a device NEEDS HELP

    hi guys i want to make a device consists of - a motor - stick (60 cm long, 0.4 Kg) - remote control - step motor to pull a rope -buttries the idea is the main motor rotates the stick for seconds or for a minute. and the step motor pulls the rope 360 or 720 degrees. and all these...
  30. T

    60hz AC device in a 50hz country

    I've heard that frequency differences can cause the motor to rotate 17% slower than it normally would... UNLESS it is a universal motor. The device in question is listed as running on a universal motor, but is also listed as AC / 60hz only. Does this still apply? Thanks.
  31. honestrosewater

    Revolutionary Device to Make Labeling Easier for Visually Impaired

    http://web.mit.edu/newsoffice/2009/braille-0821.html" MIT students develop device that could make labeling easier for the visually impaired. Product could be on the market next year. A device that started out as a class project last fall is moving rapidly toward becoming a commercial product...
  32. E

    Creating a Device from Patent Info: Is it Legal?

    I have a device I need made, but I don't know if there is enough information in the patent to have an engineer create it. Here is a link to the device...
  33. E

    Automated mouse pressing device

    I'm doing something that requires pressing my computer's mouse button once every 15 minutes so I'm trying to find something that will automatically do it for me whether I'm there or not. If anyone has seen that Simpsons episode where Homer uses the drinking bird to press the "Y" button on his...
  34. C

    Photoelectric device in circuit

    Homework Statement Suppose that 2 identical photoelectric devices are connected to the same electrical circuit, and the devices are connected in parallel with each other. Compared to the voltage generated by a single device, the total voltage supplied by the parallel devices will be...
  35. E

    Accurate Height(above sea level) Measurement Device

    Hi Guys I am new engineering and would appreciate any advice or ideas on this project. I need to measure the height above sea level of a small vehicle that I am building.. My first idea was GPS, but the vehicle is going travel under a thick steel structure, so it will not work. I thought...
  36. Saladsamurai

    Torque-RequiredStair-Climbing Device

    I am trying to figure out how to design a stair-climbing device similar to a hand-cart that climbs stairs. I know that the loading will be ~500 lb. It uses a 3-wheel climbing design design like http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200381541_200381541" except...
  37. G

    I don't remember the name of this optical device

    Hi, time ago I found some Youtube videos and a website about this kind of device made of mirrors that invert the light coming from an object, and the effect (even if I don't remember precisely) should be to disrupt the sense of depth. This is a quickly made illustration of this device...
  38. T

    Help on designing a device to measure light intensity

    Homework Statement I have been asked to design a device or assemble existing devices that will measure light intensity from a source across diifferent places on a table, the data has to be recorded electronically on a computer as well, the position of the measuring point has also to be...
  39. D

    The smallest measurement device

    What is a smallest system which can be considered a 'measurement device' in terms of CI. How many atoms does it consist of?
  40. A

    Electronic device turned on in presence of tesla coil

    I had a small, about 1 foot secondary tall tesla coil with about 3 inch leaders coming off the toroid, and when i turned it on, I had an LED bike blinker light that would turn on when I would turn on the tesla coil. The blinker was about a foot away from the coil. I was wondering if anyone...
  41. Z

    How much Storage capacity could an Alien Device have?

    Lets assume an Alien race that's 1.2 billion years ahead of human civilization in terms of technology. Do you think they'd be able to store the entire internet in one of their single device? If not, then how much storage do you think they'd have? Discuss..
  42. D

    Learning device, help me expound: on Faraday's choice of ion , and unionized

    Learning device, help me expound: on Faraday's choice of "ion", and "unionized" So I was writing down some notes to myself on electrochemistry (100 level college chemistry---elementary electrochemistry chapter) and I wrote down the word "unionized" (as in, 'un-ionized') and realized that there...
  43. E

    MOSFET Device Ratings Overview

    What are the major device ratings for a MOSFET?
  44. L

    COMSOL _ frequency response of piezoelectric device

    Hi, I'm trying to model the frequency response of a thin PZT disc using COMSOL, but I am not sure how to calculate the impedance Z vs frequency. I defined the current density at the top electrode as I=-imag(nJ_smpz3d) and then plotted V/I using the domain plot parameters in the postproc menu...
  45. N

    Ideas or research topics in semiconductor devices and device physics

    hi I am doing my Electronics and Communication Engineering..I need a topic for paper presentation.Im more interested in semiconductor devices and device physics..It's like,i would like to address any physical limitation in the existing technology in reducing chip size.(this is the only topic i...
  46. S

    Are There GPS Devices Small Enough to Install Inside a Laptop?

    Is there anyone who knows of a tracking device small enough to install inside a notebook/laptop. Apart from RFID tags which only track within a given range. A GPS device that would track an asset as it were a car
  47. Z

    Thermodynamics, two engine device

    Homework Statement Suppose you build a two-engine device with the exhaust energy output from one heat engine supplying the input energy for a second heat engine. We say that the two engines are running in series. Let e1 and e2 represent the efficiencies of the two engines. (a) The overall...
  48. S

    What Happens if You Power a DC Device with AC Voltage?

    I was just curious what would happen if a device working at for example, 5 V DC voltage, is given 10 V peak to peak AC voltage. Would the device still operate? maybe it depends on the device but can someone briefly explain ..? thanks!
  49. B

    Understanding the Working Principle of Energy Saving Devices

    Hi Guys, :smile: I have heard of many energy saving devices available commercially, which when connected in parallel with the household mains, cause reduction in electricity bills. In smaller sizes they can be connected in parallel with any household power recepticle and cause reduction in...
  50. T

    Reducing the pipe dimension to a heating device

    Let's say there is a water based heating device that has 3/4" connection nipples. The pipe that leads to the device is 5/4". If one ignores pressure- and head loss, does it make any difference how far from the device the pipe reduces from 5/4" to 3/4" ?
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