Voltage drop Definition and 195 Threads

Dear All, I’m facing some problem when I try to determine the total voltage drop (%) from the source to the load. Assume the condition as follow: 1. DB-A is serving 3 number of individual load (#1,#2 and #3) , each 100m away from DB-A, single phase, 5kw, pf=0.85, V=240V,by using...

22 Dec 2009 21:16 Voltage drop question Hi All; Total noob, first post:smile: I'm working on a small robotics project. I have an embedded computer (5V) and 2 motors with a controller. It's all powered from a 4.8V NIMH battery. The problem I'm having; As the battery gets...

Homework Statement Prove that for a line having resistance R, and reactance X, and supplying load of P+jQ has an approximate voltage drop of: Vr = [RP+XQ]/Vs Homework Equations none given. The Attempt at a Solution I made a diagram, with R, X, and P+jQ in series. Vr is the...

Is voltage the potential energy difference between source A and B in a circuit? If so in absense of resistance and the presence of a 3V battery does point A have 3V to begin with and at point B there is 0 volts. Is all potential energy converted to kinetic energy when moving from A to B? A is...

the depletion region is resposible for voltage drop all that is fine but in forward bias there is no depletion region hence there can be no voltage drop but it is mentioned in my book that the voltage will drop by .7 volt how come this can happen also i have many doubts in transistor...

Hi Experts :!), I tried to use a 5v dc voltage source to power a normal handheld 3v radio using a resistor to regulate the voltage. The voltage drop across the resistor seems to fluctuate constantly by about +/- 0.8 volts. So, the voltage drop across the resistor fluctuates between 1.5v...

Voltage drop is how much energy a device uses. Wattage is the rate of energy transferred into the device per unit of time. Aren't both essentially the same thing? Or am I just confused?

Homework Statement I have a couple of questions about one of my homework assignments any help would be greatly appreciated. 1. How do you find the Voltage drop of a Resistor in an AC Circuit is it similar to DC? V=IR The Resitor value is 68 ohms and there is an 80mH inductor in front of...

Homework Statement Solve for all unkown i's and V's EDIT: there is a seventh resistor that is right under the negative side of the source. Vs=12V Homework Equations V=IR The Attempt at a Solution I got the I's by finding the voltage across the entire 2 loops to equal 0, then...

Homework Statement Determine Req, the missing I's and V's? Homework Equations V=IR The Attempt at a Solution First problem is that I thought I learned that R2 and R3 are in parallel so you have to use the recipercal rule, but looking back at my notes for Interpetation...

Homework Statement A 10 μF capacitor and a 25 H inductor are connected in series with a 60 Hz source whose rms output is 112 V. Find the voltage drop across the inductor. Answer in units of V. Note: Sigfigs do not matter Homework Equations I = V/Z where Z is the impedence XL =...

Homework Statement A power station delivers 440 kW of power through 3 ohm lines. How much power is wasted if it is delievered at 12000v? Homework Equations v=IR P=I^2R P=IV The Attempt at a Solution I believe you are supposed to solve it like this but I do not understand why...

Hey guys I am completely new to this site and electronics so forgive me. I've uploaded a photo of the question. I am trying to work out at what values does just D1 conduct D1 and D2 conduct then finally all of them. Im really stuck here. i know that the diodes start conducting when the...

Hi guys, I have a very simple question but which is messing with my mind. I'm trying to figure out the voltage drop across a diode when it is reverse biased, and I'm just not getting anywhere. Can someone please take a look at the attached image and explain to me what the voltage drop across...

Compute the voltage drop along a 25 m length of household no. 14 copper wire (used in 15A circuits). The wire has diameter 1.628 mm and carries a 15 A current. Vdrop=I*R R=rho(L/A) I just plugged the resistivity of copper wire which is 1.72*10^-8, length, and area into find the...

The batteries in this cicuit create a total voltage difference of 6 volts across the circuit. Assume A is 6 vols in each circuit, Record the voltage of the lettered locations at the time when the circuit is first connected, and later when it is fully charged Note: bulbs below are identical...

I'm not understanding something very basic here. I know what voltage drop is. At least I thought I did. Here is a question: Assume you have a power supply in a control panel of a building. 500 feet away is the load device. When doing voltage drop calculations for the wire (500 feet...

Homework Statement The left plate of a parallel plate capacitor carries a positive charge Q, and the right plate carries a negative charge -Q. The magnitude of the electric field between the plates is 100 kV/m. The plates each have an area of 2 × 10-3 m2, and the spacing between the plates...

I have a 45kW VSD drive with pf of .9 and FL amp of 75A, I have a 350m run from the MCC to the VSD itself and I'm trying to calculate what size cable I need so that I don't exceed the specified voltage drop of 3%. The line-line voltage where the motor is to be placed is 400V and the cable...

Help! Voltage drop is driving me insane! 1. If the Voltage Drop across a load increases due to its added resistance, what happens to the voltage drop across other segments on the circuit? 2 Why does resistance decrease Voltage (create voltage drop) if the Voltage is a Force "APPLIED" to the...

Hi all, Here's the problem! I am attempting to create a leakage current test suite. Basically it centers around cutting the voltage reference supply to a capacitor and measuring the voltage drop. Similar to the one in the attachment. I figured that to determine the drop it would be a...

I was just looking for some insight on this problem. It is not a homework problem, my boss just asked me to figure it out. Now, there is 120V supply, with 600 feet of cable (copper) running to a load, and 600 ft neutral coming back to the supply. Ignoring the resistance of the load, he asked...

Im going to college first year in sept for Mechtronics and I am reading in advance for electricity which i know is guna give me problems. Right now I am stuck on this question. Dont tell me the answer but rather how if find it. 27) A 6V source is connected to a 100 ohm resistor by two 12...

Hi, I am having difficulty understanding why potential must drop completely over a circuit from the high side of the source to the low side of the source. I've seen this statement in several books now with no further explanation other than "it must". Consider a simple dc circuit consisting of...

Before I go too indepth, I wanted to make sure this was the proper place to post this. I stated in my intro I am doing a co-op work experience. I am working at a sawmill, and I have been asked to look at a few situations and things like that around the mill. I have been here for a couple weeks...

Homework Statement You would like to check if the battery voltage drops while it is supplying a current of 6A. You use a voltmeter designed to measure voltages up to 20V and having a resistance of 50,000 Ohms. See attachment**** This connection is in series so V= I (R1+R2) V / (R1+R2) =...

Is the voltage drop across the emitter in an NPN transistor equal to 0? What is the purpose of RE (found immediately after the emitter?)

Homework Statement Below, I have attached a schematic that was on a test question for me. (NOTE: R4 = 4*r) We were supposed to find the current leaving the battery in terms of R, C, and Vb. The thing was, I had no idea what the voltage drop across the capacitor would be since there is no q...

Homework Statement A refrigerator is marked 80W and 250 V. What is likely to happen if the voltage falls to 50V? Homework Equations P=V^2/R V=IR The Attempt at a Solution --------------------------------------------------------- R=V^2/P =250*250/80 =781.25 ohm Assuming the...

Hi all, I'd like to ask for your help in solving a problem. I'm currently working on building a small ground robot for a certain research problem. The robot is powered by batteries, and consumes a continuous 80A @ 12V when all of its systems are active. The batteries provide capacity for...

Find the voltage drop across the capacitor In a circuit where a voltage source is connected to a capacitor and resistor in series and then connected to another resistor, shouldn't the current going through the capacitor be 0ma after 5 time constants, resulting in a Vc being 0?

Hi, I am new here so please bare with me. I know a bit about electrical and Electronics but I do not recall the formula for this application...it is a long question..please help! Here it is. Six cells are connected in series to form a battery. Each cell has a rating of 1.5 volts and 1 amp...

Hi, I am having a problem with my lab report and am hoping somebody can help me understand it better. Here is my problem: I set up a series circuit with 5 resistors of 427 ohms each. The voltage of the battery was 8.70V to start. Once the battery was removed from the circuit its...

Homework Statement A pair of power transmission lines each have a 0.850 Ω resistance and carry 779 A over 9.85 km. If the rms input voltage is 39.5 kV, calculate the voltage at the other end. Homework Equations The Attempt at a Solution

Homework Statement A 6V DC voltage source is connected across both a 5kohm resistor and a 10 nF capacitor in series. The voltage drop across the resistor is what? Reply With Quote Homework Equations Q=CV The Attempt at a Solution Q= (10*10^-9 F)(5000ohms)

Hi, 1) Can anyone explain to me from a conceptual standpoint, why increased current leads to an increased voltage drop across a resistor? Mathematically, I know V=IR. But it doesn't make sense to me why increasing a current across a resistor would lead to a greater drop in energy per...

Hi! I've got another diode OR gate problem. When the voltage at the input A is 5V and it's 4.6V at the input B, does the output voltage still remain at 4.4V? Does it mean that the D2 diode is forward biased and its voltage drop* is smaller than the voltage drop of the D1 diode? *the...

Hi! There's a schema of a diode AND gate attached. Could anyone of you, please, explain me why the voltage drop across the D1 diode is so big compared to the voltage drop across the D2 diode? Thanks a lot in advance!

Hello Everyone, I am a High school student who would like for some of the senior members to take look at some of my workings and maybe help me out when I run into trouble. I am presently out of school for the summer, 2 more years of high school, left where I hop to go to University to become...

Hi, I was wondering if anyone can help me figure out how much voltage drop is happening in this particular scenario. Here is my work: Given 200HP motor at 480V that is 300 ft. away from the starter. %VD(3phase) = [12(1.73)(300ft.)(240A)]/[(Circular mil) * (480V)] x100 I use 12 for...

Hello everyone I have a slight problem. I am confused on how you know what path current is going to travel and also what voltage sources your suppose to add up to a specific resistor. For example here is my picture, already solved: The directions where to find the value of ix, the orignal...

hi i have fixed a simple circuit for lighting up a led.i have included a potentiometer. as the led is white i know that the voltage drop of the led is around 4v.when the potentiometer is at min resistance the voltege drop is actuallu around 3.8v.the problem is that when i turn the potentiometer...

i think i may have the solution to this problem, but something about it is still bothering me. the question is, if you have a 100W and a 60W bulb, both on the same series circuit, across which bulb will there be a greater voltage drop? if the same are on a parallel circuit?.. as i...

I'd like to construct a fast-reacting current overload protection device. And rather than use a FET as a short to blow a fuse I'd rather just use a semiconductor in series that I can open on overload. This is similar in operation to some "intelligent circuit breakers" based on a Intra...

When a volt meter is placed in a circuit on its own the reading is say 4v. But when a component, 'x', is placed in parallel the voltage drops. Why is this?? Physman