Voltage Definition and 1000 Threads

Hello, I was trying to check with a voltage tester if there was voltage in a light bulb socket (Edison type, no bulb present). Explosion happened (a relatively loud sound) and the safety circuit switch turned off. My question is, how can one explain this with the laws of physics and how can...

Hello everyone Im new on the forum and I just discovered what are sync machines... I have really basic question what I still cannot figure out.. I did some experiments with motor for different field currents and torques. In the result I measured armature currents and did V curves. But next...

Homework Statement Homework Equations / 3. The Attempt at a Solution [/B] Here is my attempt at the homework, I'm trying to correct my mistakes and am looking for help in the right direction.

Homework Statement A capacitor (A) of capacitance 4.0uF is charged to a potential difference of 20V. An uncharged capacior (B) is connected in parallel to capacitor A. What is: (a) the initial energy stored on capacitor A (b) the p.d. across A after B has been connected (c) the final energy...

Homework Statement Homework EquationsThe Attempt at a Solution We have been given this question along with some parameters. It asks for find drain votltage, my question is why isn't the drain voltage just equal to 1.8? I mean the resistor should be getting the entire 1.8V so?

When winding a coil around a magnetic core, if you wanted to tap the coil such that each half has the same AC voltage output, would you: A) wind each part at the same RPM for the same amount of time, to get the same number of turns for each, or B) wind the second part proportionally less, to...

I'm having trouble understanding circuits, particularly voltage. So my question is more of a conceptual dilemma. Please correct my definitions and relations if it is incorrect. Voltage is the energy provided per charge, and this energy is converted to KE once the circuit is closed, or in other...

Hello~all,thanks for taking time to read my thread. I'm in hot water now,Can anybody here help me out? Please look at the following picture,I would like to rise the voltage from 24V to 36V. And I did it according to the datasheet of CS5173. However,the chip always burned out ! I can’t understand...

1. I thought that when switch was closed, voltage at the right side of switch was 0 and long time after the switch is open, the voltage at the right side of the switch becomes 0. 2. After the switch is open ecause of the inductor, voltage at the right side of the switch is εL = induced emf So...

is= 1.2 mA i submitted my solution but it was wrong,can someone please explain why? /* i just wanted to check if my solution is correct so i don't lose marks on my homework did i do any mistakes ? if so please explain.*/ my solution:

Can someone help me on how can I get the value of capacitor on voltage multiplier and how can i double the voltage through a 20 ohm load resistor?

In the following video: I understand how the Faraday Cage works, but what has me confused is the arching. If charge is building up on the sphere and then arching over to the cage, where then is that charge sunk to? You would think it would stop arching when there was sufficient charge on the...

Hey guys! So I'm trying to do this pretty wide diameter in-runner engine, where the rotor is hollow (essentially trying to make a short tube within a short tube :D). After checking out the details between the different types of electric motors (and realizing that I can barely find any...

Why does capacitor charges up to full voltage as the emf of the battery even if there is a resistor is connected in series? I know that having a resistor means it will take longer to charge the capacitor but shouldn't some energy need to be lost in the resistor as well?

I'm trying to simulate a boost converter using multisim. I get this waveform Why does it spike like that at the start ?, is it because of the inrush current ?

So, I know the basic equation of W=V*A, but how would I physically do this in a circuit? Say I have 90W=19V*4.74A (http://www.chargerbuy.com/replacement-hp-90w-smart-ac-adapter-19v-474a.html?gclid=CjwKEAiAi-_FBRCZyPm_14CjoyASJAClUigOPligEwQ9DD87xaDL8SQcvxNtWCeo_2nl68GmdozOoxoCbW3w_wcB) for...

I have a question regarding the voltage of two different circuits. In the first circuit there is a 75 volt battery with just one 4 ohm resistor. In a separate second circuit there is a 75 volt battery again, but this time there is a 4 ohm resistor and 9 ohm resistor in series. My question is...

Let's say you have a circuit connected to a 15 volt battery. If current travels from the negative terminal of a 15 volt battery to the positive terminal, the voltage is said to rise 15 volts. I believe this is right, but correct me if I'm wrong. Assuming that is right, then does that mean that...

I have a some questions that will help me understand voltage better. 1. What is the voltage from the positive terminal to the negative terminal? Why? 2. What is the voltage from point 7 to point 8? Why? 3. Is the electric potential at the very end of the circuit (negative terminal) zero...

Homework Statement I am trying very hard to understand voltage. I am a second year engineering student in a physics II class. I am having trouble grasping the concept of voltage. Could you guys please help me out with a few questions. Please correct me if I am wrong, but isn't voltage the...

Homework Statement There are three capacitors C1 = 2 uF, C2 = 4 uF, C3 = 6 uF. Each of these capacitors were connected to 200-V voltage source so every capacitor has been fully charged. Then, the three capacitors are connected like the image above. When S1 and S2 are closed, but S3 is...

Homework Statement A pair of power transmission lines each have 0.68-Ω resistance and carry 650 Amp. If the primary voltage of the 10:1 step-up transformer is 4.6 kV, calculate the input voltage of the step-down transformer at the other end. Homework Equations P=IV V=IR IpVp = IsVs The...

Question: If you charge a capacitor circuit and then separate the capacitor, does voltage increase beyond the initial source? It seams counter intuitive that if you plug a 9 Volt battery into two metal plates and pull the plates apart that you'll get massive voltage spikes, but that's what the...

Hi, today I used 79L05 as the negative electrical level. The output filter capacitance is very large at first, just like the figure below: It is -12V. Under this condition, the chip is very hot,and the output voltage is just about -2V. I changed the 220uf to 47uf, then the chip worked well...

Homework Statement My questions are just related to part a of this problem. Homework EquationsThe Attempt at a Solution I know that potential inside a conductor is equivalent to potential on the surface of the conductor and potential at any point is an algebraic sum of potential...

Hello. Let's say a current i(t) flows through an inductor of solenoid type. Time-varying i(t) generates a magnetic field B(t) inside the magnetic core of the inductor. As B(t) is time-varying, EMF, which is the line-integral of the induced electric field E(t) along a coil (which carries i(t))...

Homework Statement I’m trying to understand what voltage is. Getting confused. I've written my confusion as questions below and answered the questions. (i) What is voltage? (ii) What is voltage passing through a lightbulb? (iii) Is POTENTIAL just another...

It should be possible to calculate the output voltage in millivolts of a pickup coil at a given frequency, based on the number of turns of wire, the wire resistance / meter, the inductance of the coil in Henrys, coil capacitance, the BH max in Joule, or flux density in Tesla, and volume of the...

Okay, so why is it that Vc assumed to be 12v - 0.7v (D1), how about contribution from the 9v battery?? Why is this not affecting the voltage at node C? Why Vc isn't 9v - 0.7v (D2) = 8.3v?

【Mod Note: moved from technical forum, so homework template is missing】 In a parallel circuit, one branch contains two equal resistors of resistance ##R_1## connected in series. The other branch contains a resistor of resistance ##R_1## in series with an inductor of variable inductance ##L##...

Homework Statement I = 0.47 A ε1 = 16.0 V ε2 = 8.0 V R1 = 5.0 Ω R2 = 9.0 Ω r1 = 1.6 Ω r2 = 1.4 Ω a) Find the terminal voltage Vab of the 16.0 V Battery b) Find the potential difference Vac of point a with respect to point c Homework Equations Vab = Va - Vb = ε1 - Ir1 Vac = Va - Vc = IR1 + ε2...

Hello, This is not a homework but I’m confused about current and voltage. My understanding is fragile and I need to reinforce it with your help. Below I’ve written what I think I know to be correct. Please correct me where required. This is high school physics.(i) Current is the...

Homework Statement [/B] Derive an expression for vc(t) in the circuit of Figure P4.13 and sketch vc(t) to scale versus. I attached a screen shot of the circuit for this problem. time. Homework Equations V = IR V = V0exp(-t/tau) The Attempt at a Solution [/B] I am trying to find the...

Homework Statement the problem is given in the attachment Homework Equations basic knowledge of ac circuits and phasor diagrams The Attempt at a Solution for point A , i calculated the potential easily. and for point B , i calculated the potential using phasor relationship .. now after doing...

Homework Statement I am working on this question from the textbook: Homework EquationsThe Attempt at a Solution I would use Cramer's method and solve for i2, then get the characteristic equation and find the roots. from there I would attempt to find the natural response. I am not sure how I...

I am doing nerve conduction research for the Intel International Science Fair and I need to make a stimulating electrode or just something that I can make with common items and that can release enough voltage to stimulate/activate the nerve. I made one using a lighter, but I am not sure that it...

Homework Statement A parallel-plate capacitor is connected to a 100 V battery until it is fully charged. The distance between the plates is d and the space between the plates is filled with air (k=1.0). Then, the battery is disconnected. If the distance between the plates is increased to 3d...

I have a very weak understanding of the particle modelling of electrical phenomena.1: Electric field =\frac{Force}{Magnitude of charge} 1 is The definition of electric field on a particle (?) 2: Force = \frac{Q1*Q2*K}{R^2}\\ 2 is Coulombs law, to find force between two particles. 3...

Hi all! I am trying to simulate a differential amplifier in LTSpice but I'm having some troubles. First, I would like to know if you could suggest me some "basic", scholastic, MOSFET and BJT model, like the 1N4148 for diodes. Secondly I designed this: Practically when I get the drain output...

I have connected the probe to secondary of ring type CT and placed a wire as primary with one multi-meter connected at both ends. When I am checking the probe ends, its 7.1V AC, but it reading 45mV AC when connected to CT. Why this is happening?

I'm a computer science student. I'm currently learning electronics so that I can program embedded devices effectively. I'm reading from the free book at allaboutcircuits.com. Why is the voltage between two points on a wire in a closed circuit equal to zero? Note that between these two points...

Hey guys! Any answers will be much appreciated! The following is a deep conceptual issue I have. The diagram is a bit crude but will suffice I think. Note: Had drawn the circular 'electric field' at the time, to just help myself over my confusion. Feel free to ignore it. As per Ohm's law V...

Homework Statement The circuit of the given problem is attached to this post (jpg file). All info is given in the photo. Problem: find VA, VB, IA. Homework Equations Ohms law KCL equations P = VI or V^2/R The Attempt at a Solution - First, I noted that VB = 9 - VA. - next, i set up a KCL...

Homework Statement In the following picture, the absolute value of the difference in electric potential, between points A and B is: A)5V B)4V C)3V D)1V E)0V Homework Equations E =qV V = iRThe Attempt at a Solution I have no idea where to start on this one, just started my electric circuits...

Homework Statement Problem details: (Look at the problem diagram) First condition states that the switch is open. The second condition states that the switch is closed and during the transition time the charge ##q## flows through the branch on which it is labeled. Find the current generator Ig...

Homework Statement In the first stationary condition of the circuit in the picture below the switch ##p## is closed and in the second it is open. The change of charge on the capacitors from 1st to 2nd condition is ##ΔQ=30 mC## Calculate the current ##I_g## Picture: Homework Equations 3. The...

This is a general question, not a homework question, and @berkeman said I should post it in the EE forum... I'm trying to get a better understanding of the relationship of dielectric constant (relative permitivity) to dielectric strength (breakdown voltage).I want to know what happens when you...

Homework Statement A line of charge with a non-uniform charge density lambda=ay, where a=−34.00 nC/m^2 lies along the y axis in the region 0≤y≤2.90 m. Calculate the electric potential of this line of charge at point P on the x axis a distance 0.80 m from the origin. Assume the potential...

Will my described method allow me to achieve my objective? If so, could you recommend a rheostat that is rated for at least 20A @120VAC that will work for my application? If not, could you describe an alternate method? Objective: Determine the ampacity of various wires at 120VAC Method: Wire a...

Homework Statement Above is the circuit I have to deal with. We are given the Vin = 6V, Vout = 3.367 V and all the R values. We are asked to find the remaining values (The I's and V's) Homework Equations [/B] Kirchhoff Voltage and current laws V = IR R's in series add Voltage from a source...