Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Inductors:
Coils which are used for their opposition to current change in a circuit are known as inductors or chokes.
CONSTRUCTION
Inductors with an air core have small inductance values and are used at high frequencies within radio tuning circuits, or as r.f. chokes to stop radio frequency currents taking certain paths in circuits. Coils for use at high frequency are made of Litz wire which consists of several thin copper wires insulated from each other.
Materials based on iron are used where a large inductance is required. Iron increases the strength of the magnetic field several hundred times. Silicon steel and nickel iron are used at frequencies up to 20kHz.
Iron cores are laminated. The laminations reduce the conversion of electrical energy to heat by making it difficult for currents in the coil to induce currents in the core. These induced currents are called ‘eddy currents' because they flow in circles through the iron core. If the laminations are at right angles to the plane of the coil windings, the core offers a large resistance to the eddy currents.
Iron based cores can be used at high frequencies if the material is in the form of a powder which has been coated with an insulator and pressed together.
Ferrite cores consist of ferric oxide combined with other oxides such as nickel oxide and may also be used at high frequencies.
Iron dust and ferrite cores increase the inductance of a coil considerably. For example, an air cored inductor of 1mH could be increased to 400mH by fitting a ferrite core. These cores also have a high resistance, thereby reducing eddy currents.
Explain interference of light? Write two essential conditions for sustained interference pattern to be produced on the screen. Illustrate a graph showing the variation of intens
When two particles tend to each other, their motion alters or their momentum modify because of their mutual interactions. This phenomenon is called as collision. During collision
Given a particle moving along a straight line with fixed acceleration a. Let u be the initial velocity of the particle and v be the velocity at time t. So by definition,
Electric Field: The electrical field because of a charge can be described as the space around the charge.
Which one of the following pairs is not correctly matched: (1) Rutherford-Proton (2) J.J. Thomsom-Electron (3) J.H. Chadwick-Neutron (4) Bohr-Isotope Ans:(4)Bohr-Is
Q. In the given circuit, calculate the current through the circuit and mention its direction. Let the current be I. 7 I + 3 I + 5I + 5 I = 10 + 8 - 2 (i.e) 20 I = 1
explain compound microscope
A bicycle has tires of radius 0.35 meters. If the bicycle is traveling at a constant speed of 7.8 m/s, approximately what angular speed are the tires rotating? a) 85 rev/min b) 197
As electric field is conservation, work done and as potential difference among two points is path independent and depends only on the position of points between which the charge is
Forging: Forging is shaping of metal either by impact or steady compression among a hammer or ram and anvil. Related to hammering or pressing of metal, the main difference among
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd