Electric circuits Definition and 136 Threads

Homework Statement A 100-W heater is designed to operate with an applied voltage of 120V. a) What is the heater's resistance, and what current does the heater carry? b) Show that if the potential difference V across the heater changes by a small amount ΔV, the power P changes by a...

Homework Statement Three 66.0 Ω resistors are connected across the sides of an equilateral triangle ABC as shown in the figure. What is the equivalent resistance between any two points AB, BC, AC of this circuit? Homework Equations The Attempt at a Solution I don't understand...

I'm trying to find how simple electric circuits behave when the input is a random signal or noise. I'm wondering if anyone is familiar with this area or know of any resources they can point me to. Thanks in advance,

I need to include an electric circuit diagram in a .doc file,but I can't find a software to draw it quickly.Does anyone have any good idea?I don't want to use Protel since it is too large

Hello,I have a problem with electric circuits .Can someone explain method of potentials,method of contour currents,3 terminals:triangle and star . .Sorry for my bad language.I need information and i don't have equations attempt at a solution.!0x a lot

Homework Statement What does it cost in cents to leave a 1800 Watt electric oven on for 7 hours? Assume that you pay 10 cents for every kilowatt hour which you use.Homework Equations Well i don't know if I am supposed to use P=E/t. i don't know how I am supposed to use it The Attempt at a...

I don't have much of a homework problem that i need help with, but the homework requires us to use a equation ... P = E / t there is a little triangle before the E i don't know what it means Thanks for help

Homework Statement ^^^^ = resistor = 10 ohm <> = 3*Vab Dependent voltage. (the voltage equals 3 times Vab) 0 = voltage source 4 v (inderpendant) o = Inderpendant Current source 2 A |--^^^^---<>---------a + | + + - | 0 o Vab | -...

Homework Statement No problem just wanted to clarify something. Would the voltmeter reading be the same or different in the two circuit diagrams below.? http://img16.imageshack.us/img16/9428/circuit1.th.gif http://img37.imageshack.us/img37/3300/circuit2.th.gif Homework Equations...

I ran across this question on another site but I didn't understand the answer that was given. The question asked that if we have a circuit that connected the positive terminal of a 9V battery with the negative terminal of another 9V battery but not connecting the battery together, why would...

Hey guys, I've just starting learning about electric circuits at school and there's something I just can't seem to get my head around. If you have two identical light bulbs in a series connected to a battery, the brightness of both the bulbs is the same. However, both bulbs are dimmer than if...

Homework Statement A battery charger is connected to a dead battery and delivers a current of 6.0A for 5.0 hours,keeping the voltage across the battery terminals at 12V in the process.how much energy is delivered to the battery? Homework Equations R=I^2RT The Attempt at a Solution...

Hi I'm new here and have this question I would like to ask. Sorry if I posted in the wrong section! My level of education is not high so please forgive me for this simple problem, though not simple to me. Q: Why is it that in, for example, a series electric circuit that the electric current is...

Homework Statement Find all of the following for the following circuit. Resistors R1 and R2 and R6 and R7 are in series. While resistors R3, R4, and R5 are parallel. Given information: ε = 15.0V ri = 0.25Ω All other R's = 2.0Ω 1)RT or R[total] (this includes the ri) 2)Vdrops...

Homework Statement http://img522.imageshack.us/img522/9016/circuitsel3.jpg http://g.imageshack.us/img522/circuitsel3.jpg/1/ Basically I need to find the brightness of the labelled lamps relative to the original lamp. It is lamps c&d and g&h which are causing me the most trouble...

The question: Suppose point A is grounded (V = 0) in Figure 21-36, in which script e = 16 V and R = 11 . Find the potential at points B and C. Here is the diagram: http://www.webassign.net/walker/21-35alt.gif I'm pretty sure that I have to use Kirchhoff's rules in order to solve this problem...

I have done the equation from this textbook, but I have no way to get the exact answers to confirm my answers. I really don't need to know how to get the answers. I just need answers to confirm them with. If you can show how to get it that is fine as well

Homework Statement If the current in an electric conductor is 2.4A, how many coulombs of charge pass any point in a 30 second interval? Homework Equations A = C/s The Attempt at a Solution I just want to make sure that I am doing this right. If my current is 2.4 A then I can write...

Homework Statement If you accidentaly leave your car headlights (current drain 5A) on for one hour, how much of the 12-V battery's chemical energy is used up? Homework Equations Well, there's Ohm's Law...and it's million forms The Attempt at a Solution First things first, I'm...

Homework Statement The power rating of a 1000-W heater specifies the power consumed when the heater is connected dto an AC voltage of 120 V. Explain why the power consumed by two of these heaters connected in series with a voltage of 120 V is not 2000-W. Homework Equations P= (V)^2/R...

"you have four identical resistors, each with a resistance of R. You are asked to connect these four together so that the equivalent resistance of the resulting combination is R, How many ways can you do it? There is more than one way. Justify your answer" I can only think of ONE way to do...

Homework Statement You'll have to forgive me... I've got some rather poor Physics books with which to consult, so this may seem rather simple. I think I understand the concepts but I don't think I have all of the information from my sources to answer this problem. A 1.5 V battery stores...

For a single resistor in a circuit all of the voltage is lost across that one resistor. But when there is more than one resistor in the circuit (in series or otherwise) the voltage is distributed according to the resistance of each resistor. Why is it that all of the voltage is not lost over the...

I was just wondering if someone knows of a good intro electric circuits book. My professor told us that there was no need to go out and by the book because he felt it is useless, and he also feels we shouldn't need a book. I have been reading a bunch of reviews of it and most of them arent good...

Homework Statement I have to give the power being absorbed by the circuit element. There's a picture. This is an easy problem. They give me the current flow in a function of time, the voltage is also in function of time. The time in which I require to give the power is at 2ms. The function for...

http://feat.putfile.com/profilepics/main/4/bobthebus-1313021205.jpg Well this is my question, its not really homework or anything. I am just curious as to how you would do this. I was thinking that it would change at all. Since in a parallel circuit all the currents add up to the same number...

I am taking an electric circuits course using Intro to Electric Circuits 7th ed. by Dorf/Svoboda. My professor mentioned something about a manual that you can buy that has mainly just a lot of different circuits all worked out for you to study, does anyone know where I can get this because the...

electric circuits-- HELP! Ok, so I have a quiz on this material tomorrow and I am thoroughly confused. My teacher gave us review problems and I keep getting them wrong. One of them was: Answer the below questions for a case in which three resitors are positioned in a series with a battery and...

Hi, this is a very nice but (at least for me) quite confusing problem on electric circuits: Before you read this, it will be helpful to have had a look at the attached picture (sorry - the quality is quite nasty) _______ By considering each half of the circuit on the left below as a...

Hi Guys... I'm trying to learn diff.eq on my own and I'm stuck on a problem and I don't even know where or how to begin: the problem is: the pacemaker shown in the figure (first attatchment) is made up of an electric battery, a small capacitor, and the heart which functions like a resistence...

Why is Ohm's Law not an effective method for solving some electric circuits?

when solving a RL or RC circuit, what's the easiest way to tell if it is a natural response problem or step response?

Diagram The answer is A and i don't really understand why that is so. I am thinking that since Emf - Ir= Vterminal. The current must go up but i am not sure exactly why is that happening. I've read through my handbook but can't seem to find anything on this type of problem.

Hi Could someone point me to a comprehensive resource (either book or website or both) which explains the method of symmetry for the solution of simple resistive electric circuits? Thanks and cheers Vivek

My Physics teacher sent this out as a difficult problem, to us at least, to impress her if we could find the answers. Thanks for just guiding me on it; i don't want someone to do it for me, but rather, id just like someone to start me out basic Physics stuff i know: Ohm's Law, Parallel...

In electric circuits, you know how parallel voltage is the same throughout, but series voltage adds up to the supply. What if there is a battery connected in series to two resistors. However, what if one of the resistors continues on parallel. How, then would u find the volts of the solo...