Electrical Engineering | Engineering Notes India

Semiconductors: Atomic Structure and Types | Electrical Engineering

Semiconductors are solid materials, either non-metallic elements or compounds, which allow electrons to pass through them so that they conduct electricity in much the same way as a metal. Characteristics of Semiconductors: Semiconductors possess the following characteristics: 1. The resistivity is usually high. 2. The temperature co-efficient of resistance is always negative. 3. The contact between semiconductor and a metal [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Semiconductors|Comments Off

Properties of Insulating Materials | Electrical Engineering

The properties of insulating materials are enumerated and discussed as under: 1. Electrical Properties 2. Thermal Properties 3. Chemical Properties 4. Mechanical Properties. 1. Electrical Properties of Insulating Materials: i. Insulation Resistance: It may be defined as the resistance between two conductors (or systems of conductors) usually separated by insulating materials. It is the total resistance in respect of two [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Insulating Materials|Comments Off

Ferroelectric Materials and Its Applications | Electrical Engineering

In this article we will discuss about:- 1. Introduction to Ferroelectric Materials 2. Common Ferroelectric Materials 3. Properties of Ferroelectric Materials in Static Fields 4. Spontaneous Polarisation 5. Applications of Ferroelectric Materials 6. Anti-Ferroelectric Materials 7. Permanent Electric Materials. Introduction to Ferroelectric Materials: If the centre of gravity of the positive and negative charges in a body do not coincide [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Ferroelectric Materials|Comments Off

Fuse: Types, Merits and Demerits | Electrical Engineering

In this article we will discuss about:- 1. Meaning of Fuse 2. Metals and Alloys Used for Fuse 3. Types 4. Merits 5. Demerits. Meaning of Fuse: An electric circuit is designed to carry a definite amount of current. If a much greater current passes through the circuit, there may be serious damages. To check it, a length of a [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Fuse|Comments Off

Top 13 Conductors of Electricity | Engineering

The various electrical conducting materials are discussed as follows: 1. Copper 2. Aluminium 3. Tungsten 4. Iron and Steel 5. Nickel 6. Tin 7. Lead 8. Alloys 9. Carbon and Graphite 10. Molybdenum 11. Platinum 12. Mercury 13. Non-Linear Conductors. 1. Copper: Properties: (i) Its colour is reddish. (ii) It is highly malleable and ductile. (iii) It can be cast, [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Conductors|Comments Off

Insulating Materials and Its Classification | Electrical Engineering

In this article we will discuss about:- 1. Introduction to Insulating Materials 2. Characteristics of a Good Insulating Material 3. Classification of Insulating Materials 4. Air Spaces in Insulation 5. Effect of Moisture on Insulation 6. Protection of Insulation against Moisture. Contents: Introduction to Insulating Materials Characteristics of a Good Insulating Material Classification of Insulating Materials Air Spaces in Insulation [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Insulating Materials|Comments Off

List of High Resistivity Materials | Electrical Engineering

The various high resistivity materials (including alloys) are described below: 1. Tungsten: (i) Hard metal. (ii) Resistivity twice that of aluminium. (iii) Can be drawn into very thin wires (for making filaments). The thinner the tungsten wire, the greater is its tensile strength. (iv) In the atmosphere or inert gas (Nitrogen, Argon etc.) or in vacuum, tungsten can be readily [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Materials|Comments Off

List of Electrical Materials | Engineering

Here is a list of popular electrical materials. 1. Materials of Low Resistivity and High Conductivity: These materials should have the least possible electrical conductivity. They are employed for making conductors for all kinds of windings required in electrical machines, apparatus and devices, as well as for transmission and distribution of electrical energy. Requirements of Materials of High Conductivity: The [...]

By Roshni|2018-04-21T07:54:26+05:30April 21, 2018|Materials|Comments Off

Relays: Classification and Design | Devices | Electrical Engineering

In this article we will discuss about the classification and design of relays used in an electric circuit. Classification of Relays: The protective relay may be defined as an electrical device interposed between the main circuit and the circuit breaker in such a manner that any abnormality in the circuit acts on the relay, which in turn, if the abnormality [...]

By Shanaya|2018-03-07T08:16:34+05:30March 7, 2018|Relays|Comments Off

Operating Principle of Different Relays | Electrical Engineering

All the relays employed for protection against short circuits operate by virtue of the current and/or voltage supplied to them by CTs or PTs. Failures in the system are indicated by the individual or relative changes in the currents or voltages supplied to the protective relaying equipment. For every type and location failure, there is some distinctive difference in these [...]

By Shanaya|2018-03-07T08:16:34+05:30March 7, 2018|Relays|Comments Off

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