Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Ferroelectric energy convertor It is a device which converts heat energy into electrical energy based on pyro-electric effect.
Definition, Formula
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Pyroelectric effect is the change in spontaneous polarization when the temperature of the specimen is changed. The pyroelectric coefficient λ is defined as the change in polarization specimen.
Diagram, Working Principle, Applications
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Crystal filter allows certain frequencies to 'pass' through an electrical circuit and cut the undesired frequencies. The crystal filters are used in radio communications, telecommunications, signal generation, GPS devices and many electronic devices.
Circuit Diagram, Advantages, Disadvantages, Application, uses
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Some naturally available crystals (such as, quartz) have the property that their resonant frequencies are constant. Hence a crystal is used as the frequency determining element in an oscillator for high frequency stability. Such oscillator is called a crystal oscillator.
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
The materials which exhibit piezo-electric effect are known as piezo-electric materials.
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
These materials have the property of becoming electrically polarized when mechanical stress is applied. This property, known as piezoelectric effect and has an inverse.
Definition, Examples, Dielectric hysteresis, Properties and Application of ferroelectric materials
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
When a dielectric material is subjected to an external electrical field, the dipole moments tend to orient themselves in the direction of the applied electrical field. This results in a finite polarisation. The polarisation increases linearly with the applied electrical field.
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
The selection of right dielectric materials for capacitor applications is based on various parameters like value of capacitance, frequency, tolerance size and operating voltage.
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Some important types of dielectric breakdown in solid are (i) Intrinsic breakdown and avalanche breakdown (ii) Thermal breakdown (iii) Chemical and electrochemical breakdown (iv) Discharge breakdown (v) Defect breakdown
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
In practical applications, the failure or breakdown of a dielectric material is of grat concern to engineers. There are different mechanisms by which dielectric breakdown takes place.
Definition, Formula, Factors
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
The voltage at which breakdown occurs is called breakdown voltage. This is also called disruptive voltage. It is expressed in volts.
Definition, Statement, Formula, Applications, Uses, Classification, Types
Subject and UNIT: Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Gauss's law is an important basic law in electrostatics.