Mica capacitors, Physics

Assignment Help:

Mica is a mineral that can be readily sliced into thin chips, makes an excellent dielectric and is used in capacitance incorporated in circuits requiring stable and accurate capacitors with low losses and high leakage resistance. Mica sheets are brittle and cannot be rolled up like a paper dielectric. The capacitor consists either of alternate layers of metallic foils, with mica forming a stack which is then hermetically sealed in some hard plastic or alternatively the mica can be silvered stacked and enclosed in a plastic moulding. The main characteristics of this type of capacitor are low power factor, high voltage operation and long term stability at room temperature. Precision mica capacitors, used as sub-standards Can be adjusted to better than 0.01 percent stability for values over 1μf. They are sealed in cases to protect against moisture. The silvered mica plate capacitor has a better temperature coefficient when compared to the stacked plate type. Both types exhibit slight non-cyclic capacitance shifts during temperature variation yielding a nonlinear temperature capacitance characteristics.

Specifications

Capacitance range                                    1pf to few micro farad

Ratings                                                    up to 2000V

Temperature                                             550C to 1250C

Dielectric constant                                     8

Power factor                                             approx 0.0003 at 1 MHz

Applications: They are used in filter circuits and tuning circuits.

 

 


Related Discussions:- Mica capacitors

Optics, how does a magnifying glass work to produce a large or smaller imag...

how does a magnifying glass work to produce a large or smaller image?

What is elasticity, The characteristic of a body by virtue of which the bod...

The characteristic of a body by virtue of which the body takes its real configuration when external deforming forces are removed is called as elasticity.

What is wheatstone bridge, What is Wheatstone bridge? Assume the condition ...

What is Wheatstone bridge? Assume the condition for which Wheatstone bridge is balanced.

Collision, The collision between two bodies be elastic if bodies are?

The collision between two bodies be elastic if bodies are?

Kinematics, an aeroplane is moving horizontally with a velocity of u . it d...

an aeroplane is moving horizontally with a velocity of u . it drops a packet from a height h. the time taken the packet in reaching the ground is?

Curie-weiss law, Curie-Weiss law (P. Curie, P.-E. Weiss) A more genera...

Curie-Weiss law (P. Curie, P.-E. Weiss) A more general shape of Curie's law, that states that the susceptibility, khi, of an paramagnetic substance is associated to its thermo

Number of neutron, Number of neutron in C 12   is (1)6 (2)7      ...

Number of neutron in C 12   is (1)6 (2)7      (3)8 (4)9 Ans: (1)6

Triangle of force, Triangle of force Two or more forces can be added or...

Triangle of force Two or more forces can be added or subtracted to produce a Resultant Force .  If two forces are equal but act in opposite directions, then obviously they can

Zeener diode, how zeener diode work as a regulator?

how zeener diode work as a regulator?

Types of bond: covalent bond, (B)  COVALENT BOND:     What about ...

(B)  COVALENT BOND:     What about reactions between two non metals? Many non metals do bond together. Hydrogen atoms, for instance, frequently react with other hydrogen

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd