# What is Electric circuits: Definition and 121 Discussions

The Electric VLSI Design System is an EDA tool written in the early 1980s by Steven M. Rubin. Electric is used to draw schematics and to do integrated circuit layout.
It can also handle hardware description languages such as VHDL and Verilog. The system has many analysis and synthesis tools, including Design rule checking, Simulation, Routing, Layout vs. Schematic, Logical Effort, and more.
Electric is written in Java, and was released as part of the GNU project in 1998 under the GNU General Public License.
In 2017, Electric development ceased, but support and bug fixes continue.

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1. ### AC circuit analysis involving resistors and inductors

Summary:: Hi anyone can explain me how to solve this circuit, finding the current I2 and I1? Really don't know where to start Thanks
2. ### I How is Potential Difference Created in Electrolytes?

When we have a resistor in electronic conductors, potential difference is created via surface charges which accumulate on conductor surface. What about electrolytes? I am not sure if electrolytes can create potential difference in the same way since surface in electrolytic conductors isn't as...
3. ### Internal Resistance of the Battery - Ohmic Resistance

When current starts flowing in a circuit, voltage of the battery drops from EMF value. There are three sources of this however here I am only interested in ohmic resistance of the battery. EMF of the battery is created because of electrochemical processes on both electrodes which create...
4. ### Engineering Circuit Analysis -- How many independent equations can be written using KCL?

I think there are 4 essential node. So we can write 3 KCL independent equations.

6. ### How does the current divide in parallel inductors?

I apologize using English fluently because I am not an Enlgish speaker. When I tried to solve this problem, I used current divider rule. So, $$i_o(t) = \frac{3}{3+5}*4e^{-2t} = 1.5*e^{-2t} A$$ However, This was wrong. The answer is $$1.5*e^{-2t} + 0.5 A$$ If I use $$V_O = L*\frac{di}{dt}$$...
7. ### Is seeing believing in physics?

I am new here and I am not going to say I have any formal schooling in physics or electrical engineering. I have been in the automotive field for almost 40 years. What I am getting at is, myself and my research partner came across a very unusual circuit about 4 years ago. We spent about 3 years...
8. ### Engineering Fundamentals of Electric Circuits - Sadiku Question on KVL

Hi, this is my first time posting, I'm glad there is a space like this where we can share our doubts and hopefully get some help from other students. As you can see on the image above, there's a KVL applied to the circuit in practice problem 2.6, but my question is the following: On equation...
9. ### MHB Help with electric circuits

I tried redrawing the above circuit so that it resembles more like the circuit diagrams we see from day to day. However, what confused me was when it asks for the resistance measured between A and B versus between A and C What's the difference between those two, and how would the calculations...
10. ### Capacitor filled with two conducting materials

Homework Statement a) State the boundary conditions for the electric field strength E and electric flux density D at a planar interface separating two media with dielectric constants ε1 and ε2. b) A parallel plate capacitor with a plate separation d is filled with two layers of different...
11. S

### Ideal conditions in which circuit analysis is done

What are the ideal conditions in which circuit analysis or analysis of an electrical system is done?I know that the air friction,friction between materials is ignored in ideal systems, such as for ohms law applications.What else is ignored in analysis of ideal electrical systems?
12. ### Joule heating of resistors

Homework Statement 2. Homework Equations [/B] Consider the following circuit where: $$R_A=330 k\Omega$$ $$R_B=220 k\Omega$$ $$C= 2.2 nF$$ $$v_1(t)=6u(t) V$$ $$i_2(t)=-10u(t-t_2) \mu A$$ $$t_2 = 12 ms$$ All the currents go clockwise (with the obvious exception of the current source)...
13. ### I Lagrangian method for an LC-Circuit

In the paper http://physics.unipune.ernet.in/~phyed/26.2/File5.pdf, the author solves the LC-circuit using Euler-Lagrange equation. She assumes that the Lagrangian function for the circuit is $$L=T-V$$ where $$T=L\dot q^2/2$$ is the kinetic energy part $$V=q^2 / 2C$$ is the potential energy.She...
14. S

### What is the best software for the analysis of chaos in electric circuits?

What is the best software for the analysis of chaos in electric circuits.
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### Electric circuits -- Finding the V-I characteristics of a light bulb

Homework Statement Homework Equations The Attempt at a Solution I know Ammeter and bulb goes in series and Voltmeters in parallel. But am I supposed to connect the voltmeter to the little arrow on the potential divider, or just across the bulb?
16. ### Lightning striking electric circuits

Why does lightning seem to hit objects with free electric currents inside (like computers or cell phones) more than "neutral" objects?
17. ### Rank in order, from largest to smallest, the resistance (eq)

Homework Statement There is a figure, I'll try my best to draw/describe. 1. All three resisters are in parallel ___R____ !___R____! !___R____ ! 2. 2 resisters are parallel and one in series, after the parallel (ignore the dots) ___R___ ... _____R___ !___R___ ! 3. 2...
18. ### Engineering Electric circuits methodology question

Homework Statement Homework Equations The Attempt at a Solution My problem lies in when I get equations like: and if I plug in Vi and its derivative, I get equations like: How do I solve for t in these equations if I have a sine and a cosine term that contain t?
19. ### Reducing all circuit resistors to only parallel and series?

Homework Statement The problem from the textbook is: Is it possible to connect resistors together in a way that cannot be reduced to some combination of series and parallel combinations? Homework Equations V = IR kirchhoff's current law kirchhoff's loop law The Attempt at a Solution I am...
20. ### Determining the total current of many batteries

Homework Statement The figure represents a part of a circuit, and the potential difference between the f and d is 12Volts, depending on the information shown in the figure, determine: 1-the reading of the Ammeter 2-the value of (Vb)₃ 3- the potential difference between (c , b) Homework...
21. ### Water model for electric circuits: Pipe diameter?

Hi. There's this nice water circuit model for electric circuits where pressure corresponds to electric potential and the (mass or volume) flow rate to electric current. In the water model, we can vary the pipe diameter along the circuit. Since water is practically incompressible, the flow rate...
22. ### Use KCL and KVL to find the power supplied by the two ideal sources

Homework Statement The Question wants to find the Voltage Across The Current Source 2A and 5A Homework Equations KVL KCL Ohm's Law The Attempt at a Solution I tried to Using KVL and KCL for all Closed paths and node but I just Couldn't Figure how to relate them to find the voltage across the...
23. ### Engineering Electric Circuits - Superposition and Mesh Analysis

Homework Statement Exercise 4.15 on the image. The exercise asks for the value of the current I using superposition Homework Equations Superposition theorem, nodal and mesh analysis The Attempt at a Solution I think i am doing the mesh analysis wrong, but can't see where. Can someone...
24. ### Engineering Electric Circuits problem - Superposition

Homework Statement The problemas statement is: "Find Vo and Io by the superposition principle" Homework Equations Nodal Analysis and The Superposition Theorem. The Attempt at a Solution So, I tried to shutdown first the independent 30V tension font. It led me to Vo = 8V. Then, turning off...
25. ### Second order derivatives and resonance

Homework Statement 2. Consider an electric circuit consisting of an inductor with inductance L Henrys, a resistor with resistance R Ohms and a capacitor with capacitance C Farads, connected in series with a voltage source of V Volts. The charge q(t) Coulombs on the capacitor at time t ≥ 0...
26. ### Series and Parallel Combination

[Note: Thread has been moved to the homework forums by a mentor] This is the Given problem This is my solution part 1 - What I did here is I series the R3 and R4 (R3 + R4), and I parallel the R34 to R5 (most of the calculation are from the calculator) This is my solution part 2 The...
27. ### Voltage drop in an electric circuits

I don't understand why the voltage drops only when the charges in an electric circuitnpass through resistors or electric devices, but don't drop as charges move through the wire. As charges move through the wire due to electric potential differences, from a high potential to a low potential...
28. ### Help calculating the voltage in a capacitor when t->infinite

Hello Everyone! So, I need to calculate the voltage in the capacitor, let's call it Vc(t). For t=0- I know that there is no current in the capacitor. Did some calculations and I've found that Vc(0)=6v. Now i need to know Vc(infinite) But when the switch key is opened and the time goes to...
29. ### Examining electric circuits and deducing current and voltage

Homework Statement Homework Equations equations listed below in chart The Attempt at a Solution here is my answer, i just need to know if I am doing this correctly, thanks :)[/B]
30. ### How electric circuits really work

I've been studying circuits, but I can't find any resources that really answer my specific questions. So far I understand that a battery creates a potential difference between the two terminals, one of which is positive while the other is negative. There is a buildup of positive charge on the...
31. ### Finding equal potential points in electric circuits

Hi! I have a real problem in understanding the use of symmetry for finding equal potential points in nasty electric circuits. There are lots of problems were the solution simply says: "due to symmetry reasons, nodes X and Y have equal potential", but I rarely really understand the so called...
32. ### Question about electric circuits ?

If the current is 0.5 A and the battery supplies 6 joules of energy to each coulomb then will it supply only 3 joules per half coulomb ?
33. ### PDEs and electrical circuits

Hi everyone. In electrical engineering, when you study control theory, you're taught that electrical circuits can be used to simulate the behaviour of complex systems. What I don't understand is, what are the limitation of this sistem, and why it can't be obviouslly used in a general way to...
34. ### Find the equivalent resistance between AB

Homework Statement Find the equivalent resistance between AB. Homework Equations The Attempt at a Solution I could not find any Wheatstone bridge or series parallel combination. Should I use star delta transformation ? If yes, how exactly should I use it ?
35. ### Wye Delta transformation

Homework Statement What can be special cases, in the study of electrical circuits, in which one can not apply wye delta transformation? Can someone graph them in some way? Homework Equations The Attempt at a Solution
36. ### Intro Physics Electric circuits

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

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.
38. ### Electric Circuits

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...
39. ### Nodal analysis, choosing reference node confusion

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...
40. ### Calculating combined resistance of wires

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...
41. ### Inductor in transformer

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...
42. ### Engineering Art of Electronics 3rd Edition

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.
43. ### Undetermined system for electric network

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...
44. ### What does 0 V exactly mean in an electric circuit mean?

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...
45. ### Wheatstone bridge -- Why set all 4 resistances equal?

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.
46. ### How long does it take for the batter to lose its charge?

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]
47. ### Velocity of electrons in a wire

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...
48. ### How is sinusoidal current generated?

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...
49. ### Electric circuits formulas doubts

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...
50. ### Voltage change to go from 60-W to 50-W?

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...