Switch Definition and 565 Threads

  1. anorlunda

    Insights What Happens When You Flip the Light Switch? - Comments

    anorlunda submitted a new PF Insights post What Happens When You Flip the Light Switch? Continue reading the Original PF Insights Post.
  2. H

    How to set the frequency of a switch in NI Multisim software

    I am a new user of Multisim and I am trying to make a buck converter. In other softwares, such as pspice I was able to control the switching frequency by editing properties but in Multisim, most of the switches are user interactive. I want to set frequency of 50 Hz in a switch. Kindly help me...
  3. A

    Heat energy dissipated between two conducting shells

    Homework Statement A conducting sphere of radius a is surrounded by a neutral conducting shell of radius b (b > a).Connections are provided as shown in diagram. Initially, the sphere has a charge Q. The switch S1 is opened and then closed. The switch S2 is then opened and closed. Finally, the...
  4. Salvador

    Where Can I Find a Thermo Resistor Safety Switch for My DIY Lamp?

    Good day , could someone please point me to a device that would have say two wire terminals and could interrupt the flow of current between them when a dangerous temperature is reached? the idea is simple , I built a lamp and I need some failsafe mechanism that would turn the lamp off when it...
  5. R

    Automatic electrical switch to between two paths

    I need a switch that will alternate the flow of electrical current between two diverging wires at a decided rate. Are there switches that function this way? What are they called?
  6. Michael George

    Which is better to connect a bulb switch ?

    I was installing a new bulb with a switch in my house. There was two different ways to connect the bulb and the switch as shown in the picture. Which one is better and Why?
  7. B

    Selecting SPDT Switch for 24V Supply Voltage

    Hi, I'm working on a project where I need to use a couple of relays to send an input signal back to the controller. I'm using the 24V supply voltage from the controller to power a spdt switch, but I noticed that if I keep the switch powered for awhile, it gets hot to the touch. The specs for...
  8. S

    Using MKL to Switch Between Single and Double Precision

    So I have a header file containing things like #ifndef _params_h #define _params_h #define REAL double // precision of data #define ALIGN 64 // byte size of alignment #define DBG 1 // 1 prints out results #define READIN 1 // 1 reads in white paper data, 0 randomizes data #define...
  9. Y

    Specs for a magnet to trigger a magnetic reed switch?

    Hello, for a project I'm working on i need a magnet that is attached to a spinning wheel to trigger a magnetic reed switch that's about a cm away every time that the wheel makes a rotation. I don't know which parts to buy because if the magnet is too weak or the switch too hard to trigger it...
  10. T

    Seat belt as a kill switch: need suggestions

    So I'm planning on making the seat belt to work as a kill switch for an automobile using a Reed switch and a magnet. But I'm confused as to whether I should buy or make one. If I should buy it where should I go? Please give me your suggestions as I have to find the most efficient way and I have...
  11. O

    Programs Should I switch out of Chemical Engineering to other major?

    I am currently third year student doing Chemistry and Chemical Engineering Dual Degree and I am currently miserable. Like my many friends who became ChemE majors, I didn't know exactly what I was getting into. I imagined it is like chemistry except more complicated and advanced. I am doing quite...
  12. G

    How can I get base current in this simple transistor switch?

    Hello. Please look at the attached figure first, which is cut image from transistor section of HyperPhysics. In this circuit, I only need to know base current or base voltage, IB. In order to know this VB must be known but it is already given as 0.6 V. How this value is obtained? I don't think...
  13. W

    Engineering Brainstorming Career Switch to Engineering

    Hello, I'm a non-science major who took a few math classes and has a lot of science AP credit. I was wondering what a career switch to engineering might involve (2nd bachelor's? master's?). What are some ways I could find out more about what it's like to work as an engineer (volunteering? where...
  14. A

    RC Circuit with a Switch: Potential and Charge Analysis

    Homework Statement Two resistors and two uncharged capacitors are arranged as shown above. Then a potential difference of V0 = 12 V is applied across the combination as shown. a. What is the potential at point a with S open? (Let V = 0 at the negative terminal of the battery.) b. What is the...
  15. P

    Switch mode power supplies related study in Germany

    Hi, I want to apply in Germany for MS in the area of switch mode power supplies design. Any good idea which university offer much courses in this area in English language... I want to apply in university where there is no tuition fee or a very minimum.
  16. P

    What Are Some Options for Programmable Home Automation?

    I want to switch either a standard AC socket or a USB outlet on and off on a programmed cycle. But although there are many consumer-ready timers available to do this at set times of day, programmable to the minute, I want to be able to randomize the cycles and have it programmable to the second...
  17. AdityaDev

    Understanding the Function of Switches to LAN Traffic Management

    In my computer textbook, on one page, its given that switches can't stop traffic from traveling to all other LAN segments. On the next page, it says that switches send traffic only to appropriate connections. On a YouTube video, it says both will happen. First it send the packets to all...
  18. V

    Resistance and Voltage, switch diagram

    Homework Statement [/B] Homework Equations V=IRThe Attempt at a Solution I said: A>D=F>B=C>G>H=E I assumed higher resistance would lead to higher readings. However here are the answers: H=E>C=B>G>D>F>A Can someone explain to me why this is? As you can see H=E which combined gives a total...
  19. RaulTheUCSCSlug

    Using Arduino as a Logic Switch

    I want to supply some LED's and a motor from an outside source of electricity (i.e. a battery pack, wall outlet, batteries in series, etc.) and want to use the Arduino to be able to "switch" on and off these sources so that I am able to control long strands of LED's with the Arduino (for like a...
  20. F

    Can I switch from Comp Sci to Aerospace?

    Hello. Currently i am interested on aerospace and nuclear engineering in the usa. However i was just curious about something. Is it possible for a person who has completed BS in computer science and electronics engineering from another country to switch to Aerospace or nuclear engineering for MS...
  21. R

    Random switch setting in bell theorem

    I was trying to understand Bells theorem and I found this site http://www.upscale.utoronto.ca/PVB/Harrison/BellsTheorem/Analogy.html easy to understand. I found the "The Second Analogy: More Boxes" in it easy to grasp. But one thing I didn't understand in it, where it uses the word random...
  22. Constance

    Should i switch from BS in math to MS in Engineering ?

    Hi, everyone. My Name is Constance. I am a recent graduate with a bachelor degree in pure math, I have been thinking about going to graduate school a year ago. I found out that majoring in math for bachelor is really difficult for me to find a job. However, I like math so much. I am not sure...
  23. D

    How to switch on and off capacitance on a piece of conducting material?

    I don't know if this is the right way of describing it, but I need to activate an area of capacitance on a touchscreen by applying some current to a piece of conducting material like tinfoil. I am needing to remotely turn pages on a touchscreen ereading device with a microcontroller, and this...
  24. 1

    (Answered) Finding new potential difference after switch is closed?

    Homework Statement The problem is: A 10.0-μF capacitor is charged to 15.0 V. It is next connected in series with an uncharged 5.00-μF capacitor. The series combination is finally connected across a 50.0-V battery as diagrammed in Figure P26.63. Find the new potential difference across the...
  25. burnst14

    Capacitor and Switch Potential Difference Calculations

    Homework Statement The switch is initially open and the capacitors are uncharged. The applied potential difference Vab = +210V. a.) What is the potential difference Vcd? b.) What is the potential difference across each capacitor when the switch is closed? c.) How much charge flowed through the...
  26. A

    Engineering Can i switch from computer science to computer engineering?

    I have a bachelors in computer science, i have recently become more interested in hardware aspect of computers, any help would be appreciated.(my undergrad didn't require ANY physics class).
  27. X

    Should I stick with Computer Eng or switch to CompSci?

    I've been coding for several years and I've considered switching to computer science. I've made tons of money freelance coding, and I've made some really cool things in the past. I am currently a computer engineering major. Upon looking at every course offered at my Uni, I know all of them...
  28. Math Amateur

    MHB Switch from rings and modules to analysis

    I am temporarily switching my studies from abstract algebra to mathematical analysis. I am thinking of reading the following book: Principles of Mathematical Analysis by Walter Rudin. What books to MHB members advise me to use in order to gain a full understanding of undergraduate level...
  29. L

    Does 'throw' refer to the number of circuits opened or closed in a switch pole?

    http://www.allaboutcircuits.com/videos/15.html 5:50 Why does the double pole single throw picture only throw one circuit? Doesn't it throw two circuits since there are two lines on the right side of the picture? "throw refers to how many circuits are opened or closed" <- looks like my...
  30. Matterwave

    Remind me why FLRW curvature can't switch between cases

    Hi, as we all know, the FLRW metric has 3 types of spatial curvatures, spherical, flat, and hyperbolic. I understand that of course due to homogeneity, this curvature must be spatially everywhere the same and so can not depend on the spatial coordinates. However, I can't recall what is the...
  31. D

    Solve Two Tasks with One DC Signal: Solid State Switch Circuit

    My goal is to use a single signal to do two things at the same time...when DC signal is applied turn transistor1 off and turn transistor2 on. Then when signal is not applied transistor1 returns to on and transistor2 returns to off. Frequency will be no more than 60Hz. What would this circuit...
  32. L

    How Does Closing a Switch Affect RC Circuit Components?

    Homework Statement See the imgur link http://i.imgur.com/yZsyoHx.png Homework Equations See the imgur link The Attempt at a Solution I am just reading a problem in the textbook and am not solving the problem Basically I am looking for a good explanation of how current behaves and components...
  33. W

    Engineering Tough Circuit Problem, Find Current When Switch is Closed

    Homework Statement I got questions a) and b), but I'm stuck at c) and d). Homework Equations Kirchhoff's Loop and Junction rules. Equivalent resistance in series: Req = R1 + R2 Equivalent resistance in parallel: Req = ((R1)-1 + (R2)-1)-1 The Attempt at a Solution I really haven't gotten...
  34. L

    Switching to astrophysics after photonics PhD (complications)

    Hi everyone, I'm looking for a little advice. I'm coming to the end of a PhD in photonics in about 6 months, specifically I have been looking at plasmonic nanostructures. It's gone ok, I'm at a great university and have two 1st author papers in ok journals with hopefully a third before I...
  35. K

    3 phase switch relactance motor

    Hi Im doing a project to control a 3 phase switch relactance motor using power electronics. I have choosen 3 mosfets, 2 auto couplers and 2 resistors. 1. Would there be any other devices I need ( to solder to pcb board). 2. What would the circuit digaram look like so I can solder this and...
  36. P

    When do I use a switch, and when do I use a router?

    Sorry for the stupid question but I already forgot or a bit confused. When do I use a switch, and when do I use a router? Thanks!
  37. A

    Engineering Navigating a Major Switch: My Love for Physics and Computer Science

    A very brief history about myself: I was an undergraduate student for one year at a four year university in an engineering major. I applied for engineering mainly for its employment prospects. I didn't do well that year due to emotional problems. I did so poorly that I got dismissed from the...
  38. S

    How to switch from B.Tech Mechanical to MSc Physics (Nuclear Physics)?

    Hello Everyone, This post is with regards to queries for which I am still struggling to find answer. I am really confused about what to do in future. My question is how to do a MSc in Physics or Nuclear Physics after completing B.Tech? I will be explaining my situation below and I will try...
  39. H

    Necessities to switch to IT/Programming Career?

    Hello, I'm currently working as an actuary, but I am considering switching to a computer career of sorts. Let me preface first by saying that I do not intend to belittle or pigeonhole such a career by the way I speak about. For instance, it's kind of annoying when people talk of actuaries in...
  40. C

    Programs Master's without related bachelor's degree?

    I graduated in 2011 with a bachelor's degree in Economics and no clue of what kind of career I wanted. I fell into insurance and don't care much for it. Since graduating, I have become better acquainted with myself and discovered an interest in astrophysics and computer programming. I...
  41. S

    Probable electron field emission switch

    Hi again , i did some reading about this topic on google and there were only a few articles about it , so I would like to ask you for some advice.I ask this from a previous thread i asked about electrons in vacuum...
  42. Salvador

    Calculating Photoelectric Current in Amps

    Hi, how could i calculate the current I would get from the photoelectric effect, so that the end result would be in amps? If I have a certain lightsource or source of powerful enough em radiation to conduct the photoelectric effect , how could I calculate the intensity needed for given current ...
  43. P

    Switch Function: Interval Restriction for Functions

    Hi i was wondering if there is such a function/operator/something that restricts a function within an interval. I know that doesn't make a lot of sense but ill show you what i mean; Say i want to define f(x) = x for 0<x<a and f(x) = sqrt(x) for x>a. Now i know this is easily represented as a...
  44. preston8

    Component identification, possibly 'transformer switch'

    I am in the process of reverse engineering an electrical control box for a spa heater, and have stumbled upon a component that I have not encountered before. There are two of these components in the system. I was not able to find any information from the part numbers. The coil leads me to...
  45. A

    Programs How the heck does one switch degrees from Undergrad to Masters?

    I was talking to my cousin about how some engineers study MBA after finish their undergrad. She herself is did BBA and told me that MBA is relatively easy as it mainly is common sense. However, I was reading about people who studied Economics, Engineering, etc. in undergrad and then studied...
  46. I

    C/C++ How to Use C++ Switch Statements: Examples and Tips for Beginners

    Write a switch statement that checks origLetter. If 'a' or 'A', print "Alpha". If 'b' or 'B', print "Beta". For any other character, print "Unknown". Use fall-through as appropriate. End with newline. Sample program: #include <iostream> using namespace std; int main() { char origLetter =...
  47. A

    Medical Is it possible to completely switch personality types?

    Just a couple of months ago, I was a very gregarious, energetic person. Over time, however, I think I've lost some energy. Nowadays, I usually don't like talking at all because I think it's tiring. I just put my headphones on and play music to myself. I'm a guitarist who has on stage...
  48. M

    Where Can I Find a 7-Position Rotating Cylinder Switch for My Prototype Device?

    I'm working on a prototype device, and I'm currently figuring out the form factor. On the turn indicator of my car, there is a ring with several positions that will control the lights. I'm thinking that something similar would work well on the handle of my device, and I'm looking to purchase...
  49. W

    Programs Should I switch my perspective major away from Physics?

    Was interested in Physics ever since 6th grade when my science teacher taught us a few physics concepts. So when I got to high school, took a college preparatory Physics class. Pretty cool stuff. Loved having my mind abused day in and day out. I couldn't wait to the day I graduated and became...
  50. preston8

    Digitally Controlled Audio Splitter Switch

    Hello, I'm needing to send an intercom signal from a lobby to one of eight different rooms. I am creating a touch-screen interface with a Raspberry Pi under the hood that acts as an intercom. The user needs to be able to select any room they wish to speak to (even all of them at the same...
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