Voltage Definition and 1000 Threads

  1. H

    DG Connection: Estimating Voltage Rise at Point of Common Coupling (PCC)

    Hi! According to the book "Renewable Energy on Power Systems" by Freris & Infield, the voltage rise due to injection of power in pcc can be estimated from the Thevenin equivalent representing the network "upstream" pcc (Figure 1). The Thevenin voltage can be taken as the nominal voltage in the...
  2. F

    Calculate resistance if the switch is closed 2 battery with different voltage

    Homework Statement before that, can you tell me about "current flow in this circuit" if : A. the switch is open B. the switch is closed the Question is No. 1 Calculate the resistance of R if the value of the current I in the figure is 0.50 A. ( i think it is related to no 2) no 2. Calculate...
  3. S

    Voltage output of a photodiode (solar cell)

    Hi, I'm trying to figure out how the angle of incidence will affect the voltage output of a photodiode. The obvious answer that comes to my mind is that the voltage output should be proportional to the cos(α), where α is the angle of incidence of light. However, I couldn't find any...
  4. G

    What Determines Voltage Reference and Measurement Accuracy?

    An example of how trying to teach someone exposes gaps in your knowledge: I was talking to someone about why we have line, neutral and Earth conductors. We got on to the fact that the Earth is an enormous sink and source of charge, so anything referenced to it can be considered 0 volts. Then...
  5. N

    How to measure output voltage of B200?

    Hi, I am a new student and trying to to measure the power and voltage output from B200 SDR device (https://www.ettus.com/content/files/b200-b210_spec_sheet.pdf) using oscilloscope (TDS3000 Series: https://www.atecorp.com/ATECorp/media/pdfs/data-sheets/Tektronix-TDS3000_Series_Manual.pdf)...
  6. E

    Experimenting with Windings: Maximum Voltage Output?

    I attach an image of something I am experimenting with. The picture itself (and added text) should be self-explanatory. 1) Which way should my windings (clockwise or counter-clockwise) go around P1; P2; P3 & P4 for maximum voltage (V) ? [ 1 Ø ] [ 1 x single enamelled copper conductor ] [...
  7. R

    Finding resistance and its change from a V-I graph

    Homework Statement The question reads: The following graph shows the relationship between voltage V and current I, through a particular electrical component. (The line in graph is straight, not showing properly in the photo) What is the electrical resistance of this component when the...
  8. A

    Source transformation, current & voltage sources

    < Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown >[/color] Hi, I was working on a the source transformation and i got to the part where there are two current sources in the circuit. The current sources were added together (giving they were going...
  9. J

    N00b alert: Reducing High, Pulsing Voltage

    Hi all, I am trying to reduce a pulsing voltage (coming from an electric fence charger) of 5kV down to 5V. I already tried using a voltage divider, but the voltage is coming out very inconsistently—anywhere from 7V to 170V. I found the schematic attached (from a thesis paper) but I'm not too...
  10. C

    Voltage Splitter Troubleshooting: 14.8V to 11.1V

    Hi I have a lipo 14.8 V battery to power a motor. I want to use same battery to power a video transmitter, a TS832. The tx takes a 11.1V input. Made a voltage splitter off 14.8 battery that produces 11.4 V with respect to ground. Does not power tx when plugged in. When I plug a 11.1 V...
  11. C

    Electrical Efficiency of Ionized Air?

    Alright It's been over a year since I've posted and received amazing help the last time I did. Now I've a question I cannot seem to find an answer to. Say you have an electrical charge and use a transformer to step up the voltage high enough to where it arcs in air. Then you have a conductive...
  12. O

    Threshold voltage calculation of a CMOS gate

    Hello all, I want to know a suitable way to calculate VTL and VTH of a gate having the gate schematic and constituent transistors SPICE model (NMOS/PMOS models). Is there an easier than doing hand calculations ?
  13. G

    Can I Use 500W Voltage Converter on 110-127V Appliance?

    I am bit rusty on my physics. I hope some of you can help me and check if what I have done is correct. I have an appliance which is rated for a voltage range of 110-127 volts, drawing 4.5 amps. I would like to use it on 220 volts using a 500 Watts converter. However, I just wanted to make sure...
  14. Asmaa Mohammad

    The voltage across an AC source and a resistance in series

    Homework Statement In the circuit below, the RMS of the AC source is 100V, the inductive reactance is 50 ohm, the capacitive reactance is 200 ohm, the resistance is 40 ohm and the current flows in the circuit is 0.644 A. Determine the reading of the voltmeter. Homework EquationsThe Attempt...
  15. Eric Willems

    Effects of high voltage & current on a large volume of water

    Hi, For a book that I’m writing, i need to know how to describe the following, if the situation described is ever possible, otherwise I'll have to come up with another scenario. A surge of high voltage electricity at a gas-insulated switchgear creates a flashover whose Breaker Current Failure...
  16. MikeTownsend

    DC motor voltage recommendations for a bike and power tools

    I have been working on some projects, I build a glass grinder, faceter with a 120v induction AC motor. Its not possible to effectively change the speeds with electronic controls being a single phase motor. It is using belts and pulleys for now. So I am wanting to build several tools, rock...
  17. Shafia Zahin

    Voltage and Current in Ohm's Law

    Hello,one thing really confuses me ,in an open circuit the value of resistance is 0 and so due to v=iR the voltage also becomes 0 but my question is how can a current flow in a circuit where there is no voltage Difference? Please help. Shafia.
  18. A

    Circuit Problem -- Combining 4 resistors to make 95 Ohms

    Homework Statement 1. Use resistors of 30 ohms, 40 ohms, 50 ohms, and 50 ohms to create a circuit with a total resistance of 95 ohms. 2. Find the amount of current going through two of these resistors if the circuit is attached to a source of 12 v. 3. What would be the voltage drops for the...
  19. Windell

    How Does Voltage Influence Electron Behavior?

    Can someone please tell/explain to me how voltage affects electrons. Does it determine the speed of the electrons in a conductor? Is so why a power supply rated 12v 3A and another rated 9v 3A have the same amount of electrons traveling at the same speed through the conductor. My big question is...
  20. O

    Cathode ray tube, Voltage needed to move the beam impact spot

    Homework Statement Question: A cathode ray tube in a TV has an electron gun operating at 10 kV. a: What is the velocity (in m.s-1) at which the electrons are emitted? Answer:5.9x107 b: How many volts are needed between the deflector plates to move the beam impact spot across a 70 cm screen if...
  21. C

    Photoelectric effect : retarding potential with back current

    In the experiment of the determination of ##h## using the photoelectric effect produced by light emitted by led's there is the systematic problem of the "dark current" or "back current", i.e. the current caused by photoelectric effect on the anode of the system which is used in the expreriment...
  22. A

    Find V(o) / V(s) in Output Opamp Voltage

    Homework Statement In the figure below find V(o) / V(s) Homework Equations In an opamp current doesn't enter through the inverting and non-inverting terminals, furthermore in DC conditions a capacitor acts like an open circuit The Attempt at a Solution The way I see it, both capacitors will...
  23. A

    What is the initial voltage of the capacitor in this circuit?

    Homework Statement I would like to know the initial voltage across the capacitor terminals in the following diagram. Homework Equations when a capacitor is connected to a DC source for a long time, it acts an open circuit. The Attempt at a Solution for t < 0, we get the diagram below and I...
  24. Asmaa Mohammad

    The phase difference between current and voltage.

    Homework Statement An inductor (Xl = 40.2 ohm) is connected in series with a resistance (30 ohm) and and an AC source ( 10V , 80Hz) and the current flows in this circuit is 0.2 amp. How could you reduce the phase difference between current and voltage to zero without changing the value of...
  25. Alexander1

    Voltage Regulator Circuit Calculations

    Hey Guys, so I'm just in need of some help in relation to finding the output current after the voltage has been dropped to 6V. The circuit has an input voltage of 24V and I've attached a photo of my circuit diagram. Hopefully I haven't made any errors in that, but I've tested the circuit and it...
  26. M

    Sizing a Solar Array To Boil Water

    Hello, I am having a hard time deciding the size of a solar array to boil water for a school project. Before putting any thought into the subject I simply thought that I would just take the wattage of the panels and add them up since they are added in both series or parallel and then select an...
  27. T

    Increasing voltage regulator current

    I'm looking to draw about 6A. I have an LM338 regulator that can supply up to 5A. Searching the internet I came across this schematic, So basically when the 1R resistor drops 0.6V then the transistor conducts the remainder of the current. I calculated my own values for those two resistors. Was...
  28. Buggsy GC

    How will the voltage, current and resistance be distributed

    I have a lab to work through tomorrow morning and i need to be able to explain how the voltage, current and resistance in the compound circuit diagram below is distributed, and write an equation which can be used to measure the total resistance of the circuit. I know that when you normally try...
  29. hackhard

    Is Work Done by a Voltage Source Positive or Negative When Current Opposes EMF?

    Is the work done by a constant voltage source positive or negative when current is opposite to emf?
  30. S

    What Is the Correct Source Voltage Amplitude for Desired Power in an AC Circuit?

    Homework Statement An ac series circuit consists of a voltage source of frequency f = 60 Hz and voltage amplitude V, a resistor of resistance R = 163 ohms and a capacitor of capacitance C = 6.2x10^-6 F. What must the source voltage amplitude V be for the average electrical power consumed in...
  31. D

    Alternate derivation of output capacitor ripple voltage buck

    Homework Statement I'm trying to find the output voltage ripple of a buck converter by using just the waveforms and the inductor ripple. Homework Equations [/B] I know that the answer is supposed to be D(1-D)Vin/(16*L*C*f^2) but I keep getting D(1-D)Vin/(8*L*C*f^2)The equations I end up...
  32. A

    I What is Diffusion Voltage in Semiconductor Heterojunctions?

    I was reading this paper on rectifying properties of mangese oxide films, and came across this mention of diffusion voltage. Can anyone explain please what it is? Here's the context: In this piece of work, we successfully constructed heterojunctions by growing a manganite...
  33. S

    Kirchoff's Voltage Law and Current Law --

    Homework Statement Homework Equations Using Loop 1, 2 and 3 The Attempt at a Solution
  34. Addez123

    Fluid that emits light when applied voltage, got tips?

    Hi, Does anyone know of any fluid that emits light when current is running through it? Why? To feed to a flower, apply low voltage and make it glow. Florescent light isn't enough and bioluminescence isn't my area of expertise so turning a flower into a LED is going to be my approach. All tips...
  35. M

    Electric Element Voltage Specifications?

    Hello, I have a question about electric elements and their corresponding voltages. I am looking at powering a 1500W 120VAC element out of an ordinary kettle with a DC voltage supplied by solar panels. So, from what I understand, 120VAC represents the RMS voltage meaning that it would require...
  36. V

    Calculate vmax and voltage from X-ray distribution function

    Homework Statement The X-ray intensity distribution function for an X-ray lamp is given on the figure. What is the maximum velocity of the electrons? What is the potential difference under which the lamp is operating? Figure: http://imgur.com/01kCBc8 Homework Equations Kmax = 0.5m(vmax)^2...
  37. G

    Doubt regarding voltage balance on capacitors

    The text in the paper says that C1 has Vout/N-1 = Vout/6, C2 has 2*Vout/6 and so on... Can someone please explain how? Source : Liao, Zitao, Yutian Lei, and Robert CN Pilawa-Podgurski. "A GaN-based flying-capacitor multilevel boost converter for high step-up conversion." Energy Conversion...
  38. B

    Is the torque constant of a DC motor the same regardless of voltage?

    Hi, we know that the speed varies inversely with the torque. The more the torque, the lower the speed. From torque-speed curve, we can calculate the slope. When the applied voltage increases, the straight line shifts upward while when the voltage decreases, the straight line shifts down. How...
  39. A

    Why do the capacitors in this circuit have the same voltage?

    Homework Statement Homework Equations C = Q/V The Attempt at a Solution I understand that capacitors in parallel have the same voltage, but wouldn't they be in series after the switch is flipped, since no current goes to the left most portion of the circuit.
  40. Epoch

    Electricity: voltage calculation in serial

    Homework Statement Calculate the voltage U. The voltmeter gives a value of 80V. The Attempt at a Solution [/B] 3RI + 4RI - U = -80 How can I create a System of Linear equations if I have only one equation? Do I miss something? My answer sheet says U = 150V.
  41. ltnghia1304

    How to find the open circuit voltage?

    Homework Statement How can we find the open circuit voltage of this one: Thank you Homework EquationsThe Attempt at a Solution
  42. H

    Increase the maximum voltage rating of semiconducter

    Hello, I was wondering if there is any way of increasing a transistor or thyristor maximum voltage ratting in DC? Thanks. Edit: Just to be more precise, I am referring to the off state. I know you can the on state via a resistor.
  43. d3thkn1ght

    Solving for Zener Diode Voltage

    Homework Statement I have a problem where I need to calculate vo (i.e. output noise) and VO (i.e. DC output voltage) different resistances in a circuit with a Zener diode. The diode is reversed biased but I don't know the Vz. I have the IV curve but can't seem to wrap my head around how to...
  44. 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
  45. A

    How to calculate the voltage needed to create a plasma

    i've been reading on plasma physics and i have a couple of questions. how to calculate how much volts needed to create plasma with distance x from the electrodes of a certain gas with certain pressure? and to increase the distance do i have to increase voltage or once i have an arc or plasma in...
  46. J

    Why is Rated Voltage Used for Full Load Voltage Regulation Calculations?

    Hi, I want to calculate voltage regulation of a transfromer. I have learned that voltage regulation is (Vnl-Vfl)/Vfl. While solving some problems for practice I came across multiple questions. In some of them where the load is given I understand how to solve them. I just find the No load...
  47. chikou24i

    I Discharge voltage of materials for Li-Ion batteries

    What do we mean by a discharge voltage of a material ? and is it good to have a low one or a high one ? Thank you.
  48. E

    Battery charging: Minimum voltage differential?

    I have a question that I believe requires knowledge on the graduate level, but I can't necessarily express it in terms more complicated than plain English. If this is not so, moderator, please adjust to your taste, and thank you! If it helps to know this, I'm an audio/video systems designer and...
  49. S

    Voltage drop and current through each resistor

    Homework Statement Determine the voltage drop and current through each resistor. *This is just my sketch of the problem since I couldn't take a clear picture of it. Homework Equations Ohm's law V= IR Parallel total resistance Req=1/R1+1/R2+1/R3+... Series total resistance Req=R1+R2+R3+...
  50. Z

    Increasing voltage using operational amplifier

    I want to build own circuit usinghttps://ez.analog.com/external-link.jspa?url=http%3A%2F%2Fwww.kynix.com%2FProduct%2FCate%2F470.htmland resistors. I have 12V power source (car accumulator) and 6V input voltage (Vin). I want to get 12V Vout and 25W at the output. So that is about 2A...
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