What is Supply: Definition and 513 Discussions

In commerce, a supply chain is a system of organizations, people, activities, information, and resources involved in
supplying a product or service to a consumer. Supply chain activities involve the transformation of natural resources, raw materials, and components into a finished product that is delivered to the end customer. In sophisticated supply chain systems, used products may re-enter the supply chain at any point where residual value is recyclable. Supply chains link value chains.

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  1. K

    Can a Car Battery and Charger Replace a UPS for Powering Electronics?

    Let's say you have a UPS 550 Watts (1100 VA). How much current or watts does the unit itself used? This is important when your source itself is limited by the wiring.. let's say all your computers total 500 Watts and the wiring is sized for roughly that.. Would the UPS draw more current or...
  2. E

    Pulsating DC supply to LC circuit

    I have a very basic question for the professionals here, but I am having a small issue with my parallel LC circuit. I have an inductor that is 6.425mH, a capacitor that is 217uF (it is two 470uF aluminum electrolytic caps connected in series to make one non-polar 217uF cap). I am supplying the...
  3. Rahulx084

    Understanding the Concept of Heat Supply to a System: Explained in My Book

    My book states that Heat and work represent energy in transit. The state of the system undergoes a change after heat is supplied to it and before work is extracted from it because energy gets stored in it. My doubt is here that ,heat has been transferred to the system and it says heat is energy...
  4. berkeman

    New Medical Equipment Standards Impact Power Supply Selection and More

    Interesting article sent out by Digikey just now...
  5. Mzzed

    Creating oscillations on the output of a DC power supply

    Is there some common parameter for DC power supplies that provides the maximum oscillation amplitude allowable at the output? For some context - I would like to generate an oscillating signal powered by a DC power supply, but to prevent most of the oscillations reaching the DC supply I am going...
  6. G

    Selecting an MOV for a power supply

    I have a 30V 5A variable linear power supply, which has failed twice from transients killing the LM358 quad op-amp IC that controls the output. These transients are from driving things like a car ignition coil, for making an electric fence energiser. Simply replacing the LM358 gets it going...
  7. J

    Schematic for a Tenma DC Power Supply 705-72

    I am searching for a legible schematic diagram for a Tenma 705-72 DC laboratory power supply. Each of its two channels uses a LM723 regulator and a pair of 2N3055 power transistors. One of the channels operates normally; the second channel puts out the maximum voltage (37 volts). Any help...
  8. B

    Calculating US Nuclear Reactor Fuel Supply

    Homework Statement i have a little confusion with this problem the problem is asking me to calculate "how long could you fuel the 99 current reactors in the US?" Homework Equations The problem is asking for an evaluation of fuel energy value in comparison to demand edit:(i forgot to add that i...
  9. srinaath

    Why do we need to supply air to the cathode of a hydrogen fuel cell

    I am trying to understand the working of simple hydrogen fuel cell. We have anode (negative terminal), cathode (positive terminal), catalyst at anode to separate negative and positive ions of hydrogen atoms and electrolyte which allows only positive ions. We will be sending hydrogen fuel at...
  10. T

    Simultaneity and diversity for water supply infrastructure

    Hello, Is anyone familiar with the French Standard DTU for water supply infrastructure networks. I'm not understanding how to apply the diversity factors and coefficient of simultaneity to calculate the instantaneous maxumum demand and where to apply it. I was thinking of applying the formula...
  11. Cocoleia

    3-phase delta supply to a 3-phase synchronous motor?

    Homework Statement Can we use a 3 phase delta supply to a 3 phase synchronous motor who's stator windings are connected in star (wye)? The Attempt at a Solution I was thinking no, since I read in my notes that the rotor has to be supplied with a "continuous current" But I'm not sure. I have...
  12. G

    How to get the fuse rating you need for a DC power supply

    building a DC supply with a load voltage of 3.3V and load current of 3.3mA. all the books and schematics I'm seeing is that they're putting the fuse in the primary of the transformer, why? if i were to fuse the primary as well how do i get the rating of the fuse that i'll need? its said in my...
  13. S

    Water Supply Reliability Modeling assignment + datasheet

    I am taking a my first water management course and I need your help getting through my first Water Supply Reliability Modeling assignment. It involves a data set that I must manipulate and a problem set. I am not a civil engineer, so I do not know where to start with this. The only hint I have...
  14. Asmaa Mohammad

    Medical The preganglionic fibers which supply the thoracic viscera

    Hello, In my textbook, I read that the preganglionic fibers which supply the thoracic viscera originate in the lateral horn of the upper 4 thoracic segments. I read too that the the preganglionic fibers which supply the head and neck originate in the lateral horn of the first and second...
  15. W

    Designing a linear DC power supply

    Homework Statement Design, giving the necessary ratings and characteristics necessary for the transformer, bridge rectifier, reservoir capacitor and regulator, a 12 V, 2 A regulated power supply. Also identify any heat sink requirements. The available mains supply is 230 V ±10% @ 50 Hz...
  16. D

    Help intagrating hertzmeter into analog linear power supply

    First off I'm not an engineer nor do I have a electronics background. I have an old Linear (HP 6284A Power Supply). I would like to be able to display Hz/CPS. I need to measure the speed of a tattoo machine. (basically two coils that make and break connection through out its use. From what...
  17. G

    What Could Be Causing the Malfunction in My Linear DC Power Supply?

    Lavolta BPS 305 0-30V and 0-5A. I was showing a young lad how you can energise a car ignition coil and get a spark on the output, and that this effect can be improved by adding a cap in parallel which forms a crude LC oscillator etc when the unit died. Silly, I know, but we got a bit carried...
  18. P

    Inductor behaviour in an AC power supply

    what is actually happening when an Inductor is connected with an ac source.(i mean at the very instant of connection is made).i know emf will be induced due to change in current.(curl of E is =-time derivative of B)here my confusion is,inorder to induce emf,current should flow first,then who...
  19. Anugrah_kora

    Power Supply Problem: 19V 3A Laptop Charger + Solenoid

    I've got an old laptop charger 19v 3A for my solenoid. I used a multimeter to check the charger without and with load. I used a solenoid of insulated 22gauge of approx 150 turns as the load. On my first try without any load, it gave 20v DC on the multimeter. When I connected the load and...
  20. T

    Filtering an LED light's power supply

    Hi, Out of interest, today I was mucking around with a 160W LED, 240V, 50hz, outdoor light. I looked at the Power Factor (it was 0.96) and the THD was 14.something %. I then wondered what would happen if I put a capacitor in parallel with the light. It was a three phase 90uF cap, so since they...
  21. Chris Miller

    B Gravitational Force and the Endless Supply of Massless Particles

    If gravitational force is caused by a particle (tensor boson) which is massless and so travels at c, why doesn't matter ever exhaust, or even seem to reduce, its supply of these particles?
  22. Anugrah_kora

    Connecting solenoids to power supply

    For a project,we thought of making solenoid engine. We made everythig by hand, including the DC power supply. The power supply worked very well, it's puts out like 20v 1A, and it was fine still after testing it for a long time connected to DC motor. When we connected it to a solenoid coil...
  23. B

    Power supply for multiple devices -- effects on accuracy

    Hi, For my project I am plotting a Force vs Displacement graph using 2 analog inputs which are going to a DAQ. The two analog inputs are coming from; -A 5k potentiometer (for the displacement) -A 1000 lb load cell sensor (for the force) I would like to use a regulated 12V DC (1Amp) power...
  24. W

    Calculation for a radial supply system

    Homework Statement [/B] Im working through my HNC with the answers but i do not know how they have come to the numbers below.Total load = 1.5/-60 degrees + 2.3/-18 degrees. =(0.75−j1.3)+(2.19−j0.71) 2. Homework Equations . Not sure yetThe Attempt at a Solution I understand how they have...
  25. W

    Voltage drop calculation for radial supply system

    Voltdrop calculations are made as shown below. Total loadLine currentI=1.5/−60∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯+2.3/−18∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ =(0.75−j1.3)+(2.19−j0.71) <<< (How to get to these numbers only from above??) =(2.94−j2.01 )=3.56/−34.4∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯MVA
  26. S

    Using this power level indicator to measure a power supply voltage

    In this project, I am using the https://www.amazon.com/dp/B005W09XYW/?tag=pfamazon01-20 as a power supply, but in my project, if my device shuts off suddenly without shutting off properly, it would require me to reboot the entire system as it won't work anymore. So I decided to use this power...
  27. P

    Low DC amp through small circuit of 14 AWG copper wire?

    I have a 2 AMP regulated DC power supply, with variable voltage 3 - 12 v. If in a small circuit, i.e, small copper wire with 1 ohm resistor. Why am i not getting at max Amps?
  28. F

    How Can I Use a Power Supply as Both a Voltage and Current Source?

    Hello, Certain power supplies can be both a voltage source or a current source. a) Voltage source: We set the voltage to a specific value we like and change load resistor. The current will vary (get smaller for larger R) but the voltage will not vary. To make the power supply a voltage source, I...
  29. wolram

    Lead in America's water supply

    https://trofire.com/2017/02/11/american-children-poisoned-lead-tainted-water/ I found this article very worrying, the lead is causing all sorts of maladies including violent behaviour, It seems that lead pipes that were laid in the civil war era are leaching out, Accelerated by chemical errosion.
  30. Helmholtzerton

    Eval op amp achieves +/- power from single power supply?

    Picture for reference is below. I'm confused as to how this is able to receive a differential voltage of +/- from a single power supply. (Yes, I know the picture says dual power supply.) Normally I have to short the negative to ground on one side of a dual power supply, and short the positive...
  31. J

    Making a 12-24v DC variable power supply

    Homework Statement So, for a school project I have to make a resistance soldering iron. As far as I know, this requires a high current going through high resistance wire (such as stainless steel in my case). I need to make this run from a standard 120v 15A wall outlet. I have figured out so far...
  32. T

    Calculating the filter capacitor for a power supply

    Trying to build a simple 9V power supply using a 7809 voltage regulator and full wave rectifier. The load current from the regulator is 1A. So I = C*dv/dt, therefore, C = I*t/(delta V) To my understanding t is the time between the two peaks or the time the capacitor supplies the load. So if...
  33. J

    A How do I supply arpack drivers with all starting vectors?

    I am using arpack (the dsdrv1 driver) to iteratively solve the eigenvalue problem Ax = λx I am interested in the first m eigenvectors, and I have very good initial approximations for these vectors, so I would like to use my m starting vectors as an initial guess. However...
  34. helofrind

    Powering High Voltage LED from Low Voltage Source: Is it Possible?

    Wanting to know if it is possible to power a LED with a forward voltage of 29.3V and forward current of 440ma from a 1.5V source with a 2400mAh Capacity? No particular need for this, more for challenge/knowledge. Have tried methods with a transformer, DC-DC converter, and lm350 constant...
  35. E

    Electrical power corridor supply

    What is required to bring hydro lines on towers together?
  36. P

    Charging Lipos @ 5C with Digital Power Supply

    I have a ton of 3.7 volt lipo's at my house, each of which can be charged @ 5C, and since each have a capacity of 270 mAH, than I should easily be able to charge them @ 1amp. I put 8 in parralel with each other so it is a 1s, 8p battery pack. each of the lipos is the same (in tems of specs, ik...
  37. G

    US vs. EU Power Supply: Understanding the Differences for Your Home

    Hi all, I've just watched a video about the problems of back-feeding your home with an inverter/battery source, most of which relate to the split-phase system in the US. It got me thinking about the differences between this and the UK (and EU) mains supply, which is single-phase 230V. This...
  38. moenste

    Time for which RTG will supply the required energy output?

    Homework Statement A newspaper article stated that the NASA Galileo space probe to Jupiter 'contained 49 lb of plutonium to provide 285 watts of electricity through its radioactive thermonuclear generator (RTG)'. (Note: An RTG is a device for converting thermal energy produced by fission into...
  39. AilingLore21

    Engineering Is my Power Supply Circuit correct in the recreated version?

    Homework Statement So the circuit drawing is in this link http://i.imgur.com/jVYm5La.jpg . Basically, we have to create a power supply circuit and using Livewire and PCB wizard program in conjunction, I created this circuit Homework Equations None? The Attempt at a Solution [/B] I can't...
  40. seemasdawange

    Calculating Capacitor Value for Transformerless Power Supply Design

    I designed one transformerless power supply and did lots of calculations for that. can anyone answer me how to calculate value of capacitor using as a smoothing capacitor parallel to zener.and also tell me if the value of capacitor is larger than required then what changes may occur in the...
  41. T

    How can I modify a LM337 circuit to increase current output?

    So many moons ago I made myself a pretty bog standard dual linear bench power supply using an LM317 and LM337 to give me -15 - 0 - +15. In an attempt to get more current out of it (for no real reason other than because I can) I got a larger transformer and a beefier rectifier, then using the...
  42. B

    How Do You Design a 12V 2A Unregulated Power Supply?

    Homework Statement Specify ratings and values for the transformer, bridge rectifier and smoothing capacitor for a 230 V unregulated power supply with an output voltage of 12 V, output current of 2 A and a ripple factor of <0.024 Homework Equations V * I V*sqrt 2 C= I/2f*Vr Id=(1+sqrt2)*ILThe...
  43. Astronuc

    How can SunToWater Technologies turn moisture in the air into drinkable water?

    https://en.wikipedia.org/wiki/Drinking_water SunToWater Technologies's units turn moisture in the air into drinkable water http://www.dallasnews.com/business/technology/headlines/20160810-with-new-water-generators-carrollton-startup-can-unlock-the-ocean-above-your-head.ece...
  44. Planobilly

    Power supply modification question

    Hi guys, Here is the amp schematic, http://www.classictubeamps.com/schematics/Marshall/1966%20JTM45.pdf Here is the power supply schematic I would like to modify and use. http://imgur.com/a/sdYAV I don't know how to get both of these schematics to display in this post...I guess I will never...
  45. Artahir

    How to calculate Battery run-time?

    I can't get my head around question about energy consumption, energy supply and run-time. I think I forgot (Im sure I forgot) something in my equation. I am trying to find a way to calculate for how long could UPS supply my PC I don't know why I can't find Amp-hours of UPC on it but let's assume...
  46. J

    Finding the voltage supply (picture included)

    I have been having trouble calculating the value of the voltage supply. From what I have learned, to calculate the value, it is V= I x R. I have already calculated the value of R2 as the problem asks, but how do I find the voltage supply if I only know the resistane and the power being...
  47. teroenza

    HeNe Laser Power Supply Components

    I recently salvaged a Melles-Griot HeNe laser from an FTIR system. I neglected to save any of the electronics except for what I think is the step-up transformer attached to the laser tube. The laser is "05-LSC-708-540" and the transformer is "05-LPM-850-045". I have a 12V power supply, but was...
  48. Planobilly

    How to analyze this power supply circuit

    What is the voltage leaving the rectifier? What is the voltage at the two 22 ohm resistors? What is the effect of the 4.7 volt zener diode?
  49. Alisdair

    Automotive Electric cars without clean energy supply....

    Hello all. I'm pretty disorganised and not very clever so I thought I'd ask you all... If you charge an electric car from a power station run on fossil fuel is it cleaner than a petrol car? I'm wondering after looking at the energy loss in converting fossil fuel to electricity and then in...
  50. T

    Improving Electrical Supply System for Lower Fault MVA: Analysis and Solutions

    Homework Statement FIGURE 3 shows part of an electrical supply system. Draw the impedance diagrams reducing to a single impedance. Calculate the fault MVA levels in each unit for a fault on the left 3.3 kV bus with the bus section switch B open and A closed. Use a base MVA of 10 and show...
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