Electric circuits Definition and 136 Threads

Hi I am looking for a book with questions and solutions on electric circuit analysis, currently on RC circuit. Thanks

Given an electric circuit, with resistors R1 and R2, find the equivalent resistance R. Data: R1 = √2.R2 Points M and N have the same electric potential so they can be connected with a conductor and this way we get the second circuit.

Homework Statement The question is given in the thumbnail... Homework Equations R = resistance P = power V = voltage I = current [/B] R = V / I P = V * I P = I * R P = V^2 / R The Attempt at a Solution The attempt at a solution is also given in the thumbnail... I know that...

I know that when we have to identify the nodes for solving a circuit with nodal analysis we always have to designate a reference node (which will be the ground node) as a reference for measuring the others' voltages. However I was practicing this and I found this example on...

Homework Statement Homework Equations R ∝ 1/A The Attempt at a Solution Since there are six copper wires and a steel core, I added the resistance of all the wires and the core and divided them by 7, though I don't think my approach is right since the resistance of the copper and steel...

In an inductor, a current waveform 90o out of phase with the voltage waveform creates a condition where power is alternately absorbed and returned to the circuit by the inductor. If the inductor is perfect (no wire resistance, no magnetic core losses, etc.), it will dissipate zero power. I...

Has anyone seen the newest edition? Is it much better than the 2nd? I own the 2nd but am interested in the newer one if it's better.

Hello! First of all, this is not a HW problem and I already solved it. Actually, it most likely was a HW problem for my friend who gave it to me. I would take the opportunity to ask exactly how to handle this: I'm not a student but I like going back to school exercises in Physics and gain deeper...

I'm a mechatronics engineering student, and I know that electronics is a requirement in most engineering programs. I'm been dealing with electronics recently and I've been studying electric circuits. I've been noticing that in some of them instead of being closed (in diagrams) they are like...

Can someone explain me,why Wheatstone bridge is most sensitive when all four resistances say A,B,C and D are equal?as far as i know condition for Wheatstone Bridge is A/B=C/D.

Homework Statement The two headlights of a car sonsume a total power of 120 W. A driver parks the car but leaves the lights on. The 12-V battery is rated at 95 A * h. Homework Equations P=IV V=IR The Attempt at a Solution I don't know any equation that associates this with time. [/B]

Electrons are moving in moves in all sorts of directions, causing the net electric charge to cancel out. But, when you apply a voltage, there's a small amount of electrons that will move towards the direction in the direction of the voltage. This is called the drift speed. Am I right? I read...

I'm delving into AC as well as attempting to understand the various wave forms used in electrical engineering, and I am curious how engineers are able to generate current which alternates in a sinusoidal manner. What specific phenomena allows us to achieve this? Is it a special circuit, or does...

Well, recently I have started to deal with electronics and I've seen several new concepts such as ohm's law, parallel and series circuits, what's AC and DC and many other topics. Ok, I have no doubt on what's direct and alternate current or what a series and parallel circuits are; rather than...

In a "brownout" situation, the voltage supplied by the electric company falls. Assuming the percent drop is small, show that the power output of a given appliance falls by approximately twice that percent (assuming resistance does not change). How much of a voltage drop does it take for a 60-W...

Homework Statement to investigate the variation of current and potential difference for two identical filament lamps and use the results of the experiment to suggest how current varies with potential difference for any number of identical lamps wired in parallel. it is suggest that i=kv^n...

Hello, Suppose we have an electric circuit consists of a battery and 2 wires connected to both ends of the battery. When the two wires are not connected together (open circuit) do the surface charges of both conductors accumulate? if yes, can we say at the end of both wires separated by the...

I don't know under what forum to post this but since I am learning about it in calculus, i guess ill just put it here for now any maybe itll get moved to the right place. I'm given a simple circuit with resistance $12 \varOmega$ and the inductance is $4 H$ with a voltage of $40 V$. Find I(t) and...

Problem statement What would the voltmeter on the parallel circurt read? In the diagram. Revelant equations : V=IR Attempt at solution: Just wanted to confirm a fact : the 10 V given in the circurt drawing would be the drop in potential meaning that it lost 10 V so the potential energy...

The term ground has always confused me. For instance: I have always thought of a battery as a collection of negative charges at the -pole and positive charges at the +pole. But with this picture what does it mean that one pole is grounded. To be grounded is I guess ideally to be connected to the...

Hi guys, i need some help here... 1. I know that by convention, the positive charge of the voltage source is taken to be the direction of current, but I'm confused by this MIT lecture vid that drew the current as appearing to be flowing from the negative terminal. You can see the drawing in...

Homework Statement Hi. I have an electric circuit attached below. The question is to find the value Vg in order for the interconnection to be valid. The answer is -2V. My question is, why is the voltage minus?

Homework Statement Homework Equations The Attempt at a Solution 12.1.1) I don't understand why V2 would have a reading of 12V when V=IR and there is no current flowing in the circuit, can someone please explain? 12.1.2) I think I understand why the voltage is 0 and that is...

Electric Circuits and Gadgets -- Basics Please Well, when I lived in India, I remembered a neighbor whose occupation was creating little gadgets, such as watches, lasers, etc. I am now living in Pakistan, and missed the chance of asking the guy how he learned what he knew. I am curious to...

1. What current flows through the 11.0 Ω resistor? a) 0.21 A b) 0.27 A c) 0.93 A d) 1.2 A To summarize: V1 = 8.0 V V2 = 5.0 V R1 = 2.0 Ω R2 = 11.0 Ω R2 = 1.0 Ω I know we shouldn't attach pictures, but the diagram does make the question a lot easier to understand. Homework...

1. A series circuit initially consists of a cell of unknown voltage, a resistor R2 of 4.0 Ω, and another resistor R2 of 6.0 Ω. A student measures the current through R2 to be 3.0 A. When a wrench that has a small resistance is dropped on the circuit, the current through R2 is reduced to 1.0 A...

Find the phase angle between i_1= - 4 sin(377t+55) and i_2= 5 cos(377t-65) The Attempt at a Solution Ok, so I converted i_1= 4 cos(377t+145) and i_2=5cos(377t-65) According to lectures in class the 'most' negative leads. So in this case i_2 leads by -65-145=210. However, if you look at the...

Homework Statement http://iceimg.com/i/2a/b2/df5d993eb7.png Homework Equations Sorry for the big picture...The Attempt at a Solution Every time i see more then 1 generator i get in trouble... i don't understand here when to add and when to substruct voltages. Is there any difference between...

Homework Statement http://edugen.wileyplus.com/edugen/courses/crs4797/dorf1571/dorf1571c04/image_n/n04f090.gif Determine values of the node voltages, v1, v2 v3, v4, and v5 in the circuit shown. The Attempt at a Solution Doing nodal analysis I came up with the following four equations...

Homework Statement Referring to the electric circuit above, when the switch(S) turn on, the brightness bulb Q and Ammeter reading increases. so my question is, why? is it true that the S create another path way for current, then at the end of S, the electric current joins the electric...

Wrong answers to problems in "Introduction to Electric Circuits, 8th Ed" I'm studying electric circuit analysis on my own using "Introduction to Electric Circuits, 8th Ed, International Student Version" by Dorf and Svoboda (ISBN 978-0-470-55302-2 to avoid any confusion) and it seems like every...

Homework Statement The problem and its solution are attached as TheProblemAndSolution.jpg. 2. Relevant equation ν = L di/dt The Attempt at a Solution I don't understand how the solution gets i = 10.0 A for t = 2 ms as well as to how it gets i = 30 – (10 * 10^3) t) (A) for 2 ms < t < 4...

Hi all, I’m deeply ignorant about how electricity works. I just wanted to confirm that the following was possible: I have a button on one end of a wire. The wire stays unified for about 3 feet, then forks into a right section and a left section, each of which is about 3 feet long, and...

I'm reading a tutorial about the basics of circuits and I don't understand this concept. In the three last circuit diagrams in the link located below, there is a break in each of the circuits. The ends of the breaking points are labeled + and -, but how can that be? My thoughts: If there...

I'll be taking a heavy workload of classes next semester. This will be the first time I'll be taking all technical classes. To ease my transition, should I take electric circuits or digital logic? What is the general consensus in terms of which one of these classes is more difficult?

The reason why I am suspecting the solution is wrong is because the final step is dividing something with units of electrons/min by something with units of electrons/meter. Am I right about the solution being wrong? If I am wrong, then what am I not seeing? If I am right that the book is wrong...

I have two problems of electricity: 1. http://i56.tinypic.com/2a6rnzs.jpg" i.Use Kirchoff's first law to find the current through the 4.00 ohm and 8.00 ohm resistors ii. Calculate the emf E1 iii. Calculat the emf E2 iv. Calculate the current through the 12.00 ohm resistor 2. A student builds...

Homework Statement What is the value of resistance R in the figure, if the current through the battery is 5.0A? Homework Equations V=IR Rt = (1/R1 + 1/R2)^-1 + R3 The Attempt at a Solution Rt = V/I Rt = 2V/5A Rt = 0.4ohms 0.4 = (1/0.5 + 1/R)^-1 + 0.1 R = -5 ohms (the...

Homework Statement [PLAIN]http://img535.imageshack.us/img535/7201/electriccircuits113.png Homework Equations p = dW/dt; p = vi; W = Integral (p(t)) dt The Attempt at a Solution I think for the most part I got parts a and b correct. What I'm having significant trouble with is...

Homework Statement A source of variable potiential difference is attached across the ends of 1.0 m of resistance wire and the potiential difference across the wire is steadily increased. Describe how the current through the wire changes and provided that the temperature stays the same, what...

My textbook tells me that the voltage in an electric circuit only drops across a resistor. I don't quite understand this; doesn't this suggest that the electrons in the current are moving at a constant velocity? I would think that, since they are moving under the influence of an electrostatic...

How do you find the current that flows through the 20 ohm resistor? See attached pdf for picture

Hi, I'm studying this electric circuits in electromagnetism now, and I never studied this before, so my questions probably have very simple answers :P. So, if there is a battery generating an electric field between its plates, there is a potential difference between the plates. If the...

Homework Statement Three 6 ohm resistors are connected in delta with terminals a, b and c between the resistors. Determine: a)The equivalent Y circuit. b)The resistance between terminals ab in both circuits with terminal c short-circuited to a. c)Assuming that a 12 V source is connected between...

Homework Statement http://img810.imageshack.us/img810/807/circuitxm.png [PLAIN]http://img810.imageshack.us/img810/807/circuitxm.png set up all the equations (Kirchoffs current and voltage law) Homework Equations Sum of i's = 0 Sum of V's = 0 The Attempt at a Solution there are 4 nodes...

Objective: Design a dependable electric circuit for a 12-volt direct current automobile electrical system. The circuit must include the following: *Two headlights which have one fuse *Two taillights which have one fuse *A windshield wiper motor with its own fuse *A switch that operates all...

Hello, If you are a student and interested in electric circuits or an instructor who is wishing to test certain electric circuits to prepare lessons, I would like to show you a new web project for online circuits simulation, its DC/AC Lab, its a flex based project that is capable of building DC...

Please help me find basic equations for the circuit