Circuits Definition and 1000 Threads

Hi, I'm confused with the solution given for this practice problem. All of these components are said to be in parallel, yet the current is worked out only across the resistors. I thought the inductor would be a short circuit to DC. Am I looking at this backwards, is it modelling the inductor...

Hi! I have been trying to understand how a "complicated" circiut can be transformed to show which resistors are connected in series and which are parallel... Sometimes I manage to do it but it's often too hard for me because I can't find any sort of algorithm about it. Could anybody show me...

Homework Statement An arithmetic circuit has two select lines S1 and S2 and does the following arithmetic operations using a full adder: [function table] Determine the simplified Boolean functions for Xi and Yi for a single stage of the circuit given inputs A & B are n-bit registers...

lets say i have a simple battery circuit 1) why is the static electric field ,produced by the potential difference of battery, parallel to the wires? shouldn't it be pointing radially outwards? (for +ve) 2) is the electric field inside the wire or outside the wire? if its outside, then how...

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

Homework Statement A security alarm for an office building door is modeled by the circuit [below]. The switch represents the door interlock, and v is the alarm indicator voltage. Find v(t) for t>0 for the circuit [below]. The switch has been closed for a long time at t=0-...

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...

Hi, :wink: In the link given below circuit #1 and #2 are same except that they have opposite polarities for the battery V. On the left bottom there is output waveform after the clipping. In the beginning I was thinking that output for both circuits, #1 and #2, will be same. But now I am...

We are studying RC circuits in my physics class and I'm just curious as to what they are even for? My instructor challenged us to go find 5 uses for RC circuits and I am stumped. I can't even find any on google. Anybody know of any?

What exactly is a zero-span circuit? How does it work?

I know this probably sounds weird, but I have a research problem that requires "random" analog circuits. Basically what this means is that I create Spice netlists by randomly adding linear and/or nonlinear components of random types with random node and parameter values. This works fine and I...

Homework Statement hi guys, i just have some theory and general questions about circuits. hope you can bear with me and be able to help me out cause I'm trying to grasp the ideas. thanks! 1) i have a RC circuit that has a switch. if the switch was close for a long time and then opened...

Homework Statement What is the inductance in a series RL circuit in which R = 7.0 kΩ if the current increases to one half of its final value in 26 µs? Homework Equations am i correct in assuming that i should be using the time constant equation: Tau=L/R The Attempt at a Solution...

Homework Statement A 20 nF capacitor is connected across an AC generator that produces a peak voltage of 5.0 V. - At what frequency f is the peak current 50 mA - What is the instantaneous value of the emf at the instant when ic= Ic? Homework Equations Ic= C(2*pi*f*Vc) Ic= Vc/Xc Xc=...

Homework Statement A .30 microfarad capacitor is connected across an AC generator that produces a peak voltage of 10.0 V. What is the peak current through the capacitor if the emf frequency is 100 Hz? Homework Equations Ic (peak current)= Vc/Xc, Xc= 1/(2*pi*f*C) The Attempt at a...

Homework Statement Why is the following situation impossible? A battery has an emf of E = 9.2V and an internal resistance of r = 1.2 ohms. A resistance R is connected across the battery and extracts from it a power of P = 21.2W. Homework Equations My book gives these equations throughout 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...

Our Physics class is doing a lab on circuits, and I need some help. I am either really confused about what to do or using incorrect data. You have a power outlet that is set up like this: 1 2 3 4 where 1, 2, 3, and 4 represent individual outlets. (for clarification, it looks like...

May anyone please help with the method of getting Thevenin Equivalent resistance (RTH) for the attached circuit. I have already found VTH to be 8V. Sim

hello everyone, i am in disagree with someone over the calculations in the circuits i will discuss with you. circuit #1: here is the diagram:- http://img156.imageshack.us/img156/2734/diodecircuit.jpg do you find it correct? please check it carefully. the circuit will only conduct...

Homework Statement I am working on this transient problem. When the switch is open, current only flows in the right loop and so the initial current on the inductor is io+ = 4A flowinf downward through the inductor. When the switch is thrown at t = 0, the other loop gets started. I...

It would be appreciated if formulas that would directly or indirectly allow the following quantities in question to be calculated are posted in this thread. The questions are listed below: 1.) How strong would a magnetic field have to be to block a given amount of electric power in a given...

Homework Statement Hello all, I have a physics project that I am working on in which I have to develop a heat engine to do something useful. Rather than do the classic putt-putt-boat or candle-powered turbine (which have to be built from scratch), I thought I'd do something unique, and build...

In the RC circuit shown, the resistance R, the Capacitance C, and the emf of the battery are all given quantities. The battery does not have internal resistance and the capacitor is fully charged after the switch is closed. Prove analytically that, regardless the values of R and C, exactly 50%...

Hi, PF :) I was self-studying AC circuits, and my main goal right now is to understand impedance. However, before that, I was wondering how one would derive the formulas for alternating voltage (and current), namely http://upload.wikimedia.org/math/5/a/0/5a0ecaa1432c6cdce653a943b4962a21.png...

Suppose you have a 3-Phase AC transmission line circuit with a phase to phase RMS voltage of 100 kV @120 degrees (100/root3 kV, phase to ground). Now alongside this line is another 100 kV RMS phase to phase 3-phase line. What is the highest RMS voltage that can exist between the near phase...

Current electricity... Homework Statement In the circuit shown(please refer to attchment) only thing missing is that the battery has an internal resistance of r. Now When key K1 is closed the ammeter reads I0 whether K2 is open or closed. But when K1 is open the ammter reads I0 /2 when K2 is...

Homework Statement A cell is connected to a 10.0 Ohm resistor. The pd across the 10.0 Ohm resistor is 10.43 V. A 4.00 Ohm resistor is connected in parallel with the 10.0 Ohm resistor. The pd across the 10.0 Ohm resistor falls to 7.87 V. Calculate the emf and the internal resistance of the...

Electrical, Circuits, Ohmslaw etc help please Homework Statement Find the resistance of a copper conductor 300m in length if it has a CSA of 4mm2. The resistivity of copper is 1.72 x 10^-8m. Homework Equations This is all the information I have gotten from my teacher and i was wondering...

Homework Statement The aluminum cable of a high-voltage transmission line carries a current 600A. The cable is 60km long, and it has a diameter of 2.5 cm. What is the power lost to Joule heating in this cable? Homework Equations Should I use the equation V=1/(4piEo)integral(dq/r) to...

Homework Statement An AC power supply with a peak volatge output of 200 volts, operating at 60 Hz, is connected to a 53 microFurad capacitor A) what is the difference in phase angle between the applied voltage and the current B) what is the rms current in the circuit C) what is...

Homework Statement I am supposed to use mesh current analysis using the following circuit diagram which is in the phasor domain: Homework Equations KVL The Attempt at a Solution Let's number these meshes from left to right 1,2,3. Here is what confuses me: If take a look at...

I really struggle with these and would just like someones input on how to best solve these, I can never seem to cancel everything out except the variable I am looking for. I have: E-i1-Ri2=0 Ri2-Ri3=0 i1+i2+i3 I am looking to solve for i1 All R's are equal to 0.73 x10^6 ohms so I just...

in a sinusoidal circuit, only the resistive part gives the average power. so why is the load impedance the conjugate of thevenin resistance, consisting of both the resistive part and inductive part, required for maximum average power?

Homework Statement For this problem we will consider a simple household circuit. In your house the power is supplied at constant voltage of 120-V (not quite...) and each circuit breaker can handle a maximum of 15-Amps. Light bulbs are rated assuming that a 120-V drop occurs across them. If...

Hey there! First post, been browsing through the forums for a little and I have found problems like this, but I still am getting the wrong answer when I try and do the things suggested. Circuit is simple, and in series. Vs = 23 V R1 = 87 Ohms C=6.1 microfarads with a switch, of course...

Homework Statement A voltage of 60cos(4 \pi t) V appears across the terminals of a 3mF (milli-farad) capacitor. (which is equal to .003 F [farad]). Calculate the current through the capacitor and the energy stored in it from t=0 to t=.125 s Homework Equations Current through an ideal...

Homework Statement In the circuit (http://i.imgur.com/II38M.jpg),a variable resistor R is connected across the terminals of a battery, and an ideal ammeter and ideal voltmeter are also connected. In the figure, E is the internal emf of the battery, and r is its internal resistance. All the...

If we have n (possibly unequal) resistors, we can combine them in various ways to produce a device with two terminals. In many cases, the equivalent resistance of this device can be found by repeatedly breaking the circuit down into parallel and series parts. Conjecture: n=5 is the lowest for...

Homework Statement sketch the output waveforms when a 5Vp sine wave with a frequency of 100 Hz is applied to each of the following circuits **see attached diagrams** Homework Equations The Attempt at a Solution

Homework Statement I need to find the Thevenin equivalent of the circuit shown: I found the open circuit voltage (VAB) by noting that VAB = V3 and used the voltage division V_{AB} = V_s\left ( \frac{R_3}{R_1||R_2 + R_3}\right ) = 12\V I am having a little trouble finding the short circuit...

Homework Statement 7. Find V1, V2, V3, I0, I1, I2, and I3 for the circuit in Figure 2. V0 = 120V R3=15 ohms R1=3 ohms R2 = 6 ohmsHomework Equations Kirchoff's law Ohm's law The Attempt at a SolutionR0 = R1 + R3 = 3 + 15 =18 ohms...

Homework Statement 1) Given the following circuit: http://img841.imageshack.us/i/electriccircuit1.jpg/ Using the concept of superposition, calculate the partial contribution from each source.2) Given the following circuit: http://img713.imageshack.us/i/electriccircuit2.jpg/ Using the...

Homework Statement The question is just asking to find the current through each of the resistors. Our teacher taught us this loop current method, and then we have to use a matrix to solve for the currents. i1 denotes loop 1 and current, etc. Homework Equations Loop 1: 4i1 - 2i2...

Homework Statement Please refer to the diagram which i have attached for better understanding... A solenoid of inductance L with resistance r is connected in parallel to a resistance R. A battery of emf E and of negligible resistance is connected across the parallel combination. At time...

Hello everyone! We all have used IC`s in making projects or whatever,but i want to know that how LOGIC GATE circuits, and other connections, are made on little IC. It sounds impossible just like writing a name on rice ! Can anyone tell me how its done !

Hi everyone, my name is Tics and I need some help with regard to DC choppers. I'd like help in addressing the following: an overview of DC chopper design in terms of application and technical requirements; Design procedures for DC choppers; DC chopper topologies; A discussion of...

Homework Statement I'm currently doing Physics 12. Its about electric fields, voltage, current, power, gravitation field and series, parallel and series-parallel circuits. I've already taken the test once and got 48% because I didn't fully study the last section which involved...

Homework Statement Homework Equations KCL & KVL: The Attempt at a Solution Ok folks :smile: I am not sure where to go from here. Someone suggested changing the 144V to its Thevenin equivalent, which I have done below. I know that I am supposed to apply KCL at each node...