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!
Electrical Properties of Dielectric Material
A loss of energy which eventually produces a rise in temperature of a dielectric placed in an alternating electric field is called "dielectric loss". The dielectric material separates the two electrodes or conductors are stressed when subject to a potential. When the potential is reversed, this change of stress is reversed involves molecular rearrangement with the dielectric. This includes energy loss with every reversal. This is because then the molecules have to overcome a certain amount of internal in the process of alignment. The energy exhausted in the procedure is released as heat in the dielectric. Dielectric losses results from the heating effect on the dielectric material between the conductors. Power from the source is utilized in heating the dielectric. The heat produced is dissipated into the surrounding material. When there is no potential difference between two potential, the atoms in the dielectric material among them are normal and the orbits of the electrons are circular. When there is some potential difference between two conductors, the orbits of the electrons vary. The excessive negative charge on one conductor repels electrons on the electrons dielectric towards the positive conductor and thus distorts the orbit of the electrons. A change in path of electrons requires more energy, introducing a power loss. The atomic structure of rubber is harder to deform then the structure of some other dielectric materials. Such as polythene, distort easily. Therefore polythene easily is often used as a dielectric because less power in consumed when its electrons orbit is distorted. When a perfect insulator is subjected to insulating voltage it is like applying alternating voltage to a perfect capacitor. In such a case there is no consumption of power. Only vacuum and purified gases approach this perfection in such cases the charging current would lead the applied voltage by 90 exactly. This would mean that there is no power loss in the insulation. In most insulating materials that is not the case. There is definite amount of dissipation energy when an insulator is subjected to alternating voltage. It is dissipation of energy that is called dielectric loss. In commercial insulators the leakage current does not lead applied voltage by exactly 90. The phase angle is always less than 90. For an insulator having a voltage V applied to a frequency f Hz the dielectric power loss can be calculated.
If two soap bubbles of different radii are connected by a tube then, what happen? Ans) When these bubbles are joined through tube..the smaller bubble(with more pressure) gets its
Is the earth the perpetual motion machine
Elasticity is defined as the ability of a solid to return to its original shape even after being expanded or contracted. Elasticity is termed as the property of a solid to return t
#quest. While music is on you will try to oppose the two ear phone pieces to attract.
Explain the term 'critical frequency' in relation to sky wave propagation of electromagnetic waves. On a particular day, the maximum frequency reflected from the ionosphere is
formula used in thermoelectric thermometer experiment
Calculate how much heat energy is required to raise the temperature of a cube of copper of side 2cm. from 300 to 320k. given: density=8933kg/m cube , atomic weight=63.55, cp=24j/k/
what happens when a melt contains 1% ag with 99%pb?
1. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. II. The relationship between an object''s mass m,
As electron hole pair (because of thermal collisions) is continuously formed in the depletion region. These are a regular flow of electrons in the direction of the N-side and of ho
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