Inductors Definition and 131 Threads

I have found a possible mistake in my book...here's the text which contains it, "Referring to figure, it can be seen that no power is disspated in a pure inductor. In the first quarter of cycle, both V and I are positive so the power is positive, which means that energy is supplied to the...

I have a theoretical question involving the properties of inductors, I hope someone is able to help! I know that the voltage across an inductor is proportional to the time rate of change of the current through the inductor, and that if the current is changed the inductor will generate a...

When an uncharged capacitor is connected to a charged capacitor there is a loss in energy due to radiation (the calculation is in the attachment "inductors_share_energy", after the inductor sharing energy calculation to this message). When a current carrying inductor(shorted on itself) is...

Well... Consider a basic RL circuit. Maxwell tells us that the induced EMF=-L dI/dt. The voltage drop across the resistor is of course RI, but why does this mean that RI =L dI/dt as every physics textbook says. That statement relies on the fact that path integral around the circuit is = 0...

Homework Statement The voltage across an L = 2.5mH inductor is v(t) = 10 cos(1000t)mV, with i(0) = 1 mA. (a) Find i(t) for t ≥ 0. (b) Find the power and energy.Homework Equations V= L * di/dt Power= V * i V * i= L * i * (di/dt) The Attempt at a Solution I really don't know where to start...

Homework Statement I've actually uploaded the question. When solving problems with magnetically coupled inductors I like to add dependent sources so that I can keep everything straight. My question is when I add the dependent sources does there need to be a specific polarity to them. With...

Why is the wire in an inductor not insulated from the other turns in the wire? Or rather, why isn't it necessary? We learn that the electricity will take the path of least resistance, so why would it bother going around each turn when it can just skim straight across the inductor and leave...

I'm looking to buy some inductors, axial or radial ones. What I need to know is the difference between measured dc current and ac current. Modeled in multisim, the max dc current through the inductor is about 1mA but the max ac current approaches 1A. I know inductors have max current values, so...

I'm trying to design a AM transmitter using a colpitts design. I see many different types of inductors available for sale, smt, torrid, dip, ferrite core, iron core, etc... Which one should I buy? I know they have different Q values and max current. What do you think the max current would be for...

Homework Statement Find the steady state expresion for i(t) in the circuit if Vs=750 Cos(5000t) mV All componets are in series Resitor = 400 Ohms Inductor = 40mH Cap = .4 \muF Homework Equations Xc= 1/(j*w*C) Xl = j*w*L Xr = R The Attempt at a Solution Ok I know...

I'm not entirely sure if this post belongs here, but I guess the topic of electrodynamics is vast. My question is; are there any materials / plants / animals that act as electric inductors? In other words, are inductors solely made up of coiled wires, or do they occur naturally? To...

Homework Statement A resistor R is connected in series with an inductor L. The battery is connected at time t = 0. How much of this energy after 2 seconds is stored in the magnetic field of the inductor? Homework Equations U_{L}=\frac{1}{2}Li^{2} i(t)=i_{0}(1-e^{\frac{-t}{\tau}})...

Homework Statement Two solenoids on the same cylindrical axis Solenoid A has 400 loops and a current of 3,5 amp. Produces a flux of 300microWb on itself and 90 microWb on solenoid B Solenoid B has 700 loopsHomework Equations Calculate the energy stored in the system.The Attempt at a Solution...

Diagram shown in attachment. Two inductors having self-inductance L1 and L2 are connected in parallel. The mutual inductance beween the two inductors is M. Determine the equivalent self-inductance Leqv for the system. I'm pretty much stuck on this one. Since the current splits off and...

The problem is: There is a circuit such that a battery (source of constant emf) is connected to an inductor and a resister (in series). After an unspecified time period, a switch is thrown, effectively bypassing the battery. I know (becuase I've seen the answer) that a) the initial current...

Homework Statement http://img134.imageshack.us/img134/8382/circujitqt7.th.jpg i0(0) = 10 A i1(0) = 20 A The currents through the inductors flow from top to bottom. And v(t) is + on top and - on bottom Homework Equations The Attempt at a Solution Find the voltage v(t) over both inductors...

1. I am currently progressing through my assignment, however I have been given a circuit with 2 values of Z: Z1 has a magnitude of 30 and angle of -31. Z2 has a real value of -12 and an imaginary number of -36. 2. When these are both converted to complex number format: Z1 = 25.715 -...

I thought I understood inductance. It's sort of an inertial property in circuits. Physically, it accounts for the fact that "it takes work to do stuff", meaning that if you put a voltage across a coil of wire, the current through that coil can't jump up to whatever steady state value it will...

So being fresh from school, a lot of times as students we dealt with unrealistic values for caps and inductors. I remember doing a textbook problem where a cap's value was 1 F. Now that I'm in the real world. What is considered to be a realistic value? To push the question further, I see a lot...

My knowledge on how inductors and capacitors operate in AC/DC is a bit shaky. My textbook and online material don't help my understanding, so I am hoping someone would be able to explain it more clearly. In DC I know that capacitors store energy and charge up by time constants and then...

Impedance and Admittance: Find Vs given Io in a circuit with 2 caps,2 inductors,2res Homework Statement Find V_s if I_0\,=\,2\angle0\deg A. http://img237.imageshack.us/img237/6291/problem954zz0.jpg Homework Equations KCL, KVL The Attempt at a Solution I made a new diagram...

Homework Statement Obtain i_1 and i_2 for t > 0 in the circuit below. http://img258.imageshack.us/img258/7765/problem60as1.jpg Homework Equations V_L\,=\,\frac{di_L}{dt} The Attempt at a Solution To get initial conditions, I made a second circuit diagram for t < 0...

Hi, If I remember correctly, if one applies an alternating voltage across an inductor then the back emf produced by the inductor increases with the frequency of the voltage. However when I decrease the frequency of the voltage to less than 100hz and I plot a trace of voltage against time...

I've been studying circuits for almost 3 months now, and I can pretty much carry out analysis of circuits with inductors. I know the basic relationships for an R-L circuit etc, how to derive the equations and so on. In other words, I can solve textbook problems. But what does an inductor...

one more electro-magnetic question: here's the set-up: two inductors, the A-B has a signal source hooked-up, C-D is open circuit. ->i1 A C ) ( + ) ( V2 ) ( - B D i1 is given as a triangular wave, v2 as a step wave for: 0 < t < 0.5, i1 has negative...

I am not quite getting how this works: i have a serially connected two inductors L1 and La (primary) and a secondary circuit with also two inductors (L2 and Lb), the problem asks to find input impedance in s-domain. The answer given is s[La + L1 - M2/(L2 + Lb)] so, could someone explain how...

Using inductors to reduce electric bill?? My professor today mentioned that if you place an inductor in one of the power outlets in your house will allow actually produce no power and will cause your electric bill to reduce since that specific outlet is causing the power meter to reverse its...

Hi there, I'm trying to derive an expression for the transient response (for a step input of magnitude V), for a non-ideal inductor modeled in the schematic I have drawn. This non-ideal inductor includes its inductance ( :smile: ), a parasitic parallel resistance and a parasitic capacitance...

Hi! Here is probably a simple problem but I can't solve it: We have an inductor (just a coiled wire) in series with a light bulb, connected to an ideal battery. The light bulb is shining and we measure the intensity of light. Now we introduce a metal piece inside the coil. AFTER the piece is...

Most people understand (gut understanding) the charging of capacitors more than that of inductors. They just apply the duality to inductors and move on (without seeking the same understanding of inductors). Teachers of my past never could explain exactly why the charging of a capacitor...

as far as i know about inductors i think it'll make an harmonic type of move... but it seems to make no sense can anyone help?