Voltage Definition and 1000 Threads

Homework Statement I need to find the gain. Homework EquationsThe Attempt at a Solution I know gain will be Vo/Vs. I originally tried to write different equations for each node, but I ended up with 5 eqns and 5 unknowns, and in the end it gave that vs=0V. Can someone give me an idea of what...

Homework Statement I am wondering if in this circuit Vb will be 0V? Homework EquationsThe Attempt at a Solution I have found all the other ones, but I am unsure if Vb will be 0 or not, and if it is then what is the logic behind it?

Hy, If we double the voltage than what will be double A. power B. Current C. Resistance D. Both a & b

In an AC circuit with only a capacitor this diagram represents the relation between the current and the voltage in it (the current leads the voltage by 90 degrees). and because: (I= dQ/dt) and ( Q=C*V) where: Q is the amount of charge, C is the capacitance and V is the potential difference...

Say you have two separate resistors in a circuit. When you close the switch on the circuit is it the electric field that flows through the circuit that effectively sets the voltage drops so a bigger voltage drop occurs across the higher resistor in proportion to its resistance such that the...

〖 mod note: moved from technical forum, so template is missing 〗 〖 mod note: click on thumbprint image to see legible image 〗 I was wondering if anyone could provide some more insight as to how to find the current through Rc. The first picture TRANSFER1 I can find the current Ic through Rc...

Homework Statement This is one of the problem i had had some help in solving but some things remain unclear to me and i will highlight them by posting the exact question in the brackets next to the line of solution so that you can see what bothers me. Hopefully you can help me better understand...

Homework Statement Schematic of circuit is not given, only the text which I translated into English. Using a voltmeter with internal resistance of 6k ohm, voltage between two points, 1 and 2 of a circuit of constant current, is measured to be 8v. Then, using a voltmeter with internal...

Homework Statement Find the cell voltage, the current at the 15 OHM resistor is 2A. Homework Equations How would I solve to find the cell voltage? The Attempt at a Solution I tried to find the voltage of the top part of the circuit but I just cannot remember how you would do that or if it...

Hi I am trying to run an RC oscillator using a 2N3904 (Datasheet for reference: http://www.kynix.com/uploadfiles/pdf8798/2N3904.pdf) The circuit looks like the following. I want to run it at 0-5v but I failed, I assume it is because the voltage is not high enough? What would you expect the...

Hey PF, first time here, I have a problem I can't seem to solve! Any help is appreciated. I am using some DC motors with peristaltic pump heads to pump water (picture). I was having issues so I've broken my circuit down to the bare basics: 1) 12V regulated power supply 2) 12V motor 3)...

Hi, The x-ray consists of the bremsstrahlung spectrum and the characteristic spectrum. We can get x-rays by using Coolidge tube where there are an applied voltage on the tube between the filament and the target. The bremsstrahlung is depeding on the PD between the filament and the target, but it...

I saw this more related to physics than chemistry. So I have been trying to model how the voltage is generated in galvanic. I couldn't find any online and I thought it would be a good exercise. I modeled ions as electric charges with different magnitude of charge. Each producing a different...

Is the "Voltage variable capacitor" described in patent US 20070242410 A1 a commercially available component? Has anyone heard of this method of changing the dielectric constant using a biasing voltage? It has been nearly 13 years since the patent was filed, but I've never heard of it. It would...

Homework Statement When the switch is open, the voltage is ##U_{ab}##. When the switch is closed the calculated max current is ##I_{max}##. Calculate the resistance of ##R_p## when its power is max and the current of ##I_g## ##R1=100,R3=200,R4=400##,##0<Rp<100## and...

Homework Statement Homework Equations 3. The Attempt at a Solution [/B] First i found the voltage ##U_{13}=\frac{E(R2+R3)}{R1+R2+R3}=50V## Then i figured that the charge on 1 and 2 is equal since the voltage across is the same right? ##Q1=Q2=U_{13}\frac{C1C2}{C1+C2}=80mC## and...

Homework Statement I have done a simple lab experiment to find the lattice constant for NaCl. Using a diffractometer, radioactive counts were measured as a function of crystal orientation angle for electron voltages of 20 and 30 kV. The average lattice constant found wasclose to the accepted...

Homework Statement (##R_5=8\Omega##) a) Calculate the current ##I_{g2}## so that the power of the generator ##I_{g1}## equals ##P_{ig1}=6.25W## b) What is ##I## then? Homework Equations 3. The Attempt at a Solution [/B]...

Where does the voltage drop of a capacitor happen? My answer would be that It produces an electric field the opposes the field of the battery along the wires. So it is continuous lose to the capacitor which stores this energy in it. Another question related to this, When a positive charge hits...

Homework Statement When the capacitor driven by DC voltage ##V_0##,it has the electric field distribution ##f(x,y,z)## When ##V=V_0e^{iwt}##,how to show the EM travel in the space forever like the light? Homework Equations ##-{\nabla}^2E-u{\epsilon}\frac{{\partial}^2{E}}{{\partial}t^2}=0...

1. Homework Statement The circuit is driven by a voltage source, Vs(t)= 8.2 cos(1.8 t − 0.25 )V . The circuit elements are given as follows. G1= 5 S,G2= 7.6 S,G3=3.8 S (Gi is the conductance of corresponding resistor Ri) L1= 20 H,C1= 5×10−2 F If we select Node 4 as the reference node...

Homework Statement In the circuit above ##E_1=E_2=E_3##, ##Ig_1=Ig_2=Ig_3## and ##R_1=R_2=R_3=R_4##. In the case when the switched is closed the power of the ideal generator ##E_2## equals ##P_{E_2}=-30W##. Then the switch opens. Calculate the ##ΔP_{E_1}##. Homework Equations 3. The Attempt...

Homework Statement Determine the voltage, Vx, if 2A passes through the 6 Ω resistor. Homework Equations V = IR The Attempt at a Solution 1/Req=2/12Ω + 1/12Ω = 3/12Ω Reciprocal of 3/12Ω = 12/3 = 4 Ω I=2A R=6 Ω V = IR V = (2A)(6 Ω) V = 12V Total resistance is 4 Ω + 3 Ω + 2 Ω = 9 Ω The...

I haven't done any Bode plots before, and so I'm reading about LDO stability and I came across this file, which I am trying to understand: http://www.ti.com/lit/an/slyt194/slyt194.pdf Under the stability analysis, it names the poles and zeroes. How are these calculated? I assume that the...

Homework Statement Find the magnetic dipole moment of a spinning sphere of voltage ##V## and radius ##R## with angular frequency ##\omega##. Homework EquationsThe Attempt at a Solution To find the dipole moment, we need to do ##I \int d \vec{a}##, which would be ##I 4 \pi R^2 \hat{r}##, but I...

Homework Statement I am asked to calculate the missing resistance(R5) when only given the voltage drop of of 14v across it Homework Equations current and divider rule ohms law The Attempt at a Solution [/B] i tried finding the current of the 6+10 ohm series resistor that is parallel to R5...

how demonstrate the formula ? the relationship between Force and Voltage and Torque? how to prove that this formula? << e-mail address deleted by Mentor >>

Homework Statement This is a simple circuit diagram from the class were we derived the equations for the equivalent resistance of parallel resistor connection. I have a quick question about this though.. Is the voltage between points ##A,B## the same as voltage between points ##C,D## and...

Homework Statement there's a paper insulated plate capacitor. a.) What should the area of the plates be when the capacitance is 0,1 μF. thickness of the paper in between the plates of the plate capacitor is 0,05mm the relative permittivity of the paper is 2,5 b.) How big of a charge can be...

Homework Statement Homework Equations 3. The Attempt at a Solution [/B] I have just started a course in electric circuits and it's rather simple but i don't get a few things. Mainly ##U=IR## and ##E## here is the voltage source. So i can use the voltage circulation rule to get the...

Homework Statement An electric potential of 5.0 V is required to run certain computer chips. A 6.0 V battery may be used to do this but it must be connect to two resistors in series. Supposing one has a resistance of 330 Ohms what should the other be? (The computer chip will be driven by the...

We made a RLC circuit in the lab and took some values of R and LC Voltage while we changed the frequency. So the experimental data seem to suggest that at resonance (VLC=18 mV : min) the Voltage of the resistor is 834 mV. But the initial voltage given was measured 1.426 V (All Values rms)...

Homework Statement i)A beam of light at wavelength 600nm, with spectral width of 4nm and spectral radiance of 1300 Wm-2μm-1, illuminates an area of 10cm2 . What is the voltage this beam could generate if converted to energy? ii) What current could this beam produce? iii) How would the current...

I am doing an experiment in which an audio voltage signal can be obtained and saved as .csv (or other formats) by oscilloscope. In a second step I want to recover it into audio voltage signal and input it into a loudspeaker. Then how can I do in the second step? Or how to transverse a .csv (or...

1. The problem stsatemesnt, all variables and given/known data A cylinder conductor of length ##l##, inner radius ##a## and outer radius ##b## is half-filled with a liquid dielectric as shown in the picture. The cylinder is attached to a battery of constant voltage ##U## and then separated from...

Homework Statement A voltage source E_0 cos ωt is connected in series with a resistor R and a capacitor C. Write down the differential equation expressing Kirchhoff’s law. Then guess an exponential form for the current, and take the real part of your solution to find the actual current...

Homework Statement Homework EquationsThe Attempt at a Solution (a) [/B]We can assume for ideal op-amps that there is: infinite input impedance low output impedance the potential for infinite amplification (b) Non-inverting op amp (c) This is the part I have trouble with. There is three...

Hello everyone, We know Davisson & Germer experiment confirms the wave nature of electron(matter). Positions of Constructive Interference produces high intensity. So at different scattering angle intensity should be different. That's fine I understand why scattering angle(position) matters for...

Homework Statement So I was studying an example and the picture given simply asked to setup a voltage divider for the values without solving for resistance. However... I want to know if I'm missing something or if this can even be solved: I attached the problem below. Homework Equations...

Hi guys, I'm new here and I was looking for a little help with a project I'm working on. I'm trying to build a saltwater battery that will connect to a phone via usb and charge the phone. However, it doesn't seem like I can connect the battery to the phone directly because the voltage and...

Homework Statement The following picture illustrate how the current in the circuit changes when you change ##E_2##. Where slope 1 represents the current flowing through ##E_1## and slope 2 represents the current flowing through ##E2## Homework Equations Usual circuit laws :P The Attempt at...

Homework Statement imgur link: https://i.imgur.com/9jozS67.png Homework Equations The Attempt at a Solution [/B] Shouldn't I use V_{rms} = \sqrt{\frac{1}{T}\int_T v^2 dt}? Which would be \sqrt{\frac{100}{2\pi}\int_0^{2\pi/100}(20+60cos(100t))^2dt} This equals \approx 79.88 V The...

Homework Statement Find the steady state amplitude in volts of the voltage across the load resistor Homework Equations V source = 4sin4t Resistors = both 1ohm Cap = 1.414F Inductor = 1.414H The Attempt at a Solution I converted to phasor domain first, then applied voltage division. Voltage...

Homework Statement I am given the following circuit: and asked to solve for v(t) and i(t) Homework EquationsThe Attempt at a Solution If this is right, I don't know where to go from here.

Homework Statement I want to know the minus/plus sign of induced voltage of each rotor segment. Like in file no.3, equation 4-19, why (vxB)•l is not equal to eab instead? Homework Equations equation 4-19 and 1-45 The Attempt at a Solution I was searching on this book, but found nothing.[/B]...

Homework Statement A uniformly charged insulating rod of length 10.0 cm is bent into the shape of a semicircle as shown in the figure below. The rod has a total charge of -9.00 µC. Find the electric potential at O, the center of the semicircle. Homework Equations V=keQ/r The Attempt at a...

This is my first time using this site so please excuse me if I missed any guidelines. 1. Homework Statement A plastic rod having a uniformly distributed charge Q=-25.6pC has been bent into a circular arc of radius R=3.71cm and central angle ∅=120°. With V=0 at infinity, what is the electric...

Homework Statement Homework Equations I(t) = E/R [ 1 - e^-t/tau)] Vseries = Sum of voltages , Vparalel= V1=V2=V3... V=I*R The Attempt at a Solution

I have a circuit and it has a cap that has around 680V and the high current that is pull it 4.22A. I need to add an LED to let me know when the Cap is drain. The problem I am having is that since the voltage and current are so high, I can't use a Hall effect sensor . I can't find one rated for...

I am trying to derive a scaling factor for an analog voltmeter for the purpose of measuring the secondary voltage of an electronic halogen transformer (EHT). http://www.ledbenchmark.com/faq/Transformers-Output-and-Compatibility.html The output voltage of these things is a "high frequency"...