Electric circuit Definition and 199 Threads

I'm conducting a lab in which I change the distance of a lamp from a solar panel and use a multimeter to measure the resulting voltage. What type of relationship am I supposed to find? My results seem to indicate either a relationship with either a quadratic equation as its model or an inverse...

Electric Circuit. Norton/Thevelin Equivalents Unsolved Problem I used a node voltage equation to try and get Vth and the I in the short-circuit to get the Rth but it didn't work. Unsolved Problem I used a node voltage equation to get Vth and I in the short-circuit. Got Rth and...

Homework Statement A battery , ammeter with resistance , 1 ohm and a resistor are connected in series .A voltmeter of 500 ohm is connected parallel to the resistor . The actual resistance of R is 100 ohm , what is the ratio of (the resistance R determined)/(the actual resistance of R) ...

Hi; Consider this circuit (ignore my bad drawing): http://img63.imageshack.us/img63/3967/diodes.png In the picture there is one cell, two diodes and a bulb. Will the current get trapped in the second branch and continuously flow around that loop? Thanks.

Homework Statement A 500 ohm resistor and a 1000 ohm resistor are connected in series with a 12 V battery of negligible internal resistance . When a voltmeter is connected across the 500 ohm resistor , its reading is 3 V . What is the resistance of the voltmeter ? Homework Equations...

How does one calculate the potential in an electric circuit when there are more than 1 batteries present? For example, in the circuit attached, how would we calculate the potential at A and B? Is it a simple addition? Thanks,

Homework Statement Four identical capacitors are connected with a resistor in two different ways. When they are connected as in part a of the drawing, the time constant to charge up this circuit is 0.91 s. What is the time constant when they are connected with the same resistor as in part b...

Homework Statement V = 1.2 kV C = 65 micro Farads R1 = R2 = R3 = 0.75 MegaOhms With C uncharged, switch S is closed (t = 0). At t = 0, what is the current through each resistor? At t = infinity, what is the current through each resistor? Homework Equations V= IR q = qo[1 - e^-t(RC)]...

I have a circuit in which I have a constant voltage passing through until I hold down on a button at which point the voltage drops to zero. When I let go of the button the voltage returns to normal. I need to add to the circuit a switch which activates when a voltage of zero is passing through...

Homework Statement find V=? http://img11.imageshack.us/img11/9152/dev1e.jpg Homework Equations The Attempt at a Solution

Hi, I just have a couple of circuit questions here 1. When we increase current in a circuit, does the charges flow faster or does more charges flow? 2. Does a resistor require electrons to pass through them or do they just require the potential energy of the electrons? Let's say if I add...

Homework Statement Entrance exam question: An electric radiator which is an ordinary constant resistor emits a heating power of 750 W at a main supply voltage of 230 V. What is the total heating power in each respective instance when two such radiators are connected a) parallel, and b) in...

Homework Statement http://img25.imageshack.us/img25/5953/elek.png Homework Equations v=IR The Attempt at a Solution I have tried finding the total resistance of the circuit and then applying ohms law. My answer is 0.65 Amps but that's incorrect. Any help is much appreciated!

Homework Statement I performed a lab where we designed an electric circuit on paper and then calculated the Current, Power, and Voltage for each of the resistors. We used one power supply. Then we built the circuit we designed and then measured the actual Current Power and Voltage for the it...

Homework Statement Lets say that I have an electric circuit with an amp and volt meter attached to it and i reverse the direction of the current from the power supply.. what will happen to the reading of both the volt meter and the amp meter? Homework Equations The Attempt at a...

Homework Statement Is the current at all points the same? If not then what is the order from highest to the lowest? http://img141.imageshack.us/img141/2418/currenthn9.th.jpg Homework Equations The Attempt at a Solution

Homework Statement http://img88.imageshack.us/my.php?image=physicsxt0.jpg The circuit shown above includes a switch S, which can be closed to connect the 3-microfarad capacitor in parallel with the 10-ohm resistor or opened to disconnect the capacitor from the circuit. Case I. Switch S is...

Can someone solve this circuit Find v and i in the circuit. I know that we have to make somethng with supernode, but where the supernode is here? How to develop this problem? Please help me :) Btw it is nice forum, today i have found that. I hope I will be able to help you in...

Why do we take ideal voltage source to have 0 impedance and ideal current source to have infinite impedance. Please explain mathematically also!

(dq/dt) + (5/(20+t))q = 20/(20+t) ... t=0 , q=1 (a) Find the charge on the capacitor at any time. This is linear so i found the integrating factor which is (20+t)^5 and solved q(20+t)^5 = 20 integral ((20+t)^4) dt and got q(20+t)^5 = 4((20+t)^5) + C my C value i got was...

Homework Statement Given the attached scheme, if R_{1}=R_{2}=R_{3}=10 Ω and \epsilon_{1}=20 V , \epsilon_{2}=10 V determine the potentials at the points A,B,C,D,E. The sources of emf have no internal resistance. Homework Equations My question is: Why is it that no current exists along...

Homework Statement At a certain angular frequency, the phase difference between U_{2} and U_{1} is 180^{\circ}. a) Calculate this angular frequency b) Calculate U_{2} at this angular frequency See the attachment for circuit configuration. Homework Equations Ohms law: U = Z \cdot I...

Physics Rollercoaster-- Simple electric circuit Hi all, I'm working on my physics rollercoaster project for grade 11 and I need a simple electric circuit to incorporate into it for more marks. At first I was thinking a circuit to bring the ball back up a hill when it reached the bottom but...

Hello. Hopefully someone here is able to answer this. I'm not sure if it's easy or hard, but it sure is frustrating... Here is the question...word for word, I would make a sad attempt at a picture, but it would probably be wrong. So... "A powerhouse near a waterfall has a large DC generator...

1. Find the current in, and the potential difference across, each resistor in the circuit shown below: The circuit is a simple parallel circuit with 2.0 ohms at the first resistor, 10.0 ohms at the second, and 20.0 ohms at the third The problem also gives you Emf which is 12.0 V and the...

Homework Statement 1. 3 light bulbs are connected parallel in the circuit ,one of them burns out .How this affects the other bulbs. 2. We have combination of parallel and series circuit(3 bulbs) and one of them R3 burns out . This gives us a series circuit with 2 bulbs .What happens to...

ENERGY TRANSFERS IN A CIRCUIT: http://www.school-for-champions.com/science/images/elect_ohms_law-dc_circuit.gif LET VOLTAGE OF CELL IS 10V. Consider this: AN ELECTRIC FIELD IS SETUP IN THE WIRE. THE FORCE DUE TO THIS FIELD ACCELERATES THE CONDUCTION ELECTRONS IN THE WIRE. AN...

IS Electric always a CLosed Loop? If Electricity pass through a Vaccum tube it is not a closed loop.. So can we consider it as a circuit?? also when we hold a charged conductor earthing take place... So charge flows through us.Can this be a circuit??

Homework Statement The course that I am taking is so poorly organized. I keep having to do questions (for marks) for which I haven't even studied the principles yet. :mad: But anyway, I was hoping someone could help me with this, I assume basic, question about electric circuits. I studied...

During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud - Vground = 4.0 x 10^8 V, with the cloud being at the higher potential. What is the change in an electron's electric potential energy when the electron moves from the ground to the...

There are a couple of things that just make no sense to me regarding circuits. Let me start off with my train of thought and how it leads into my questions, so someone can tell me where I go wrong. Question 1 (comes directly from a picture attached): A potential difference is setup...

http://www.savefile.com/files/7288537 find the current I(B) by calculation Use the current function and KVL the function is given as I(B)=0.01 (V(B) - 0.65V)^2 Can somebody pls show me the KVL ?? i tried to write the KVL as V(i) - I(B)R(i) - V(B) =0 then substitute into the function...

Hi everyone I have a hard time finding complex electrical circuits that high school students solve ...i.e. current, voltage and resistance within the circuit itself. If anyone can kindly find some of these complex electrical circuits to solve over the internet that can be any type series...

Problem-solved I have solved the problem

http://img475.imageshack.us/img475/2209/scan0010015za.png I'm supposed to find the current of the 8.0 ohm resistor. I know that V=IR, P=IV, parallel circuits change in current and have constant voltage, and series circuits change in voltage and have constant current, but I get confused of...

Can someone help me and see if this is right and explain to me how to find V6 and I6? If you can, it would be great if you could explain to me the whole thing. Thank you:blushing:

I need help with the idea of voltage as it relates to electric circuits. My book doesn't explain the concept well enough. All it says is that voltage is the force that moves charge through a circuit and overcomes resistance. Then it just states Ohm's Law, V=IR. Here are the things I don't...

hey, i'm having some trouble finding out the TOTAL resistance of the circuit shown below, what i have done is: knowing its a combination series Rtotal = Rseries + Rparallel R4 + R3 + (1/R1 + 1/R2)^-1 and i got an awnser of 37.5 Ohms, but i don't know if i did this correct, some of my...

Hello! I have a few questions that need answers. They are just simple thoughts. First of, its is said that the formula P = UI can applied to the energy being transformed every second over any component. But the formula P = (U^2)/R and the P= (I^2)R only can be applied over resistors...

Hello! I'm just preparing to write my physics 12 final and can't seem to solve a problem form a past exam that i was doing Here is the question: a circuit using a new battery which has an emf of 6.00 V and an internal resistnace of 1.00 ohms is shown on the left( In the diagram there also...

Electric Circuit help! Ok here's my question: For the cirucit shown in the drawing(attached), find the current (I) through the 2.00 ohm resistor and the voltage (V) of the battery to the left of this resistor. Ok, should I be using Kirchoff's drop=rise, and junction rules? It doesn't...

___ ___ /--|___|----|___|-\ | | | --- --- --- - --- --- | | | \-----------------/ So I've got an AC source at the left, 2 resistors (left one 2R...

How can I find the rate at which heat is generated in the resister in an electric circuit connected to a 40-ohm resistor that is embedded in a .20 kg solid substance in a calorimeter. The external portion of the circuit is connected to a 60-volt power supply. I calculated the current and it is...

Hello everyone. This problem has me stumped. The questioin asks, " find the magnitude (current) and direction of both resistor 1 and resistor2" (in the picture the top resistor is resistor 1) I know V=IR , but I am stumped at how the different potentials interact with eachorther at...

This isn't really a homework question. I'm just trying to figure things out for myself about resonance in a circuit that they haven't taught us yet. Say you have a circuit Rp || L || C and you have a sine source and some load connected to it call it Re and you want to mesaure the gain. Vi...

I have to simplify this circuit step by step, and I'm stuck on how the first step after the drawing shown should look (how it looks after the resitances labeled 2 & 4 are combined).

My question is how is electrical potential actually transmitted through an electric circuit. A charge (i.e. and electron) is moved through an magnetic field (as in a generator), the particle gains electric potential due to the work performed on it in the generator. This potential is then used...

A electric circuit is made of a resistance, a solenoid and a power source. Resistance, V= Ri Solenoid, V = L (di/dt) Power source, tension E(t) Hence, L(di/dt)+ Ri = E(t). If E(t)= 20sin(5t), if L= 4 henrys and R= 20 ohms. If the intensity equals 0 at the beginning, find the amperage of...