Magnetism And Electromagnetism - Electromagnet

Electromagnet
Points : Electromagnet, Use of electro magnets Definition: When an iron bar is placed inside a solenoid and current is passed for a short time, it is found after testing that the iron bar is magnetized. Such magnets are called electromagnets.

Magnetism And Electromagnetism - Telephone Receiver

Points : Telephone Receiver, Working Definition The ear pieces of a telephone receiver, receives sound waves converted into electric signal and converts the electric signal as into sound waves of the same frequency as the sound frequency of the speaker on the other side.
• The car pieces consist of a permanent magnet in contact with two soft iron cores. The respective coils of the insulated wire of the cores are wound in opposite directions.
• A diaphragm made of magnetic alloy is positioned in front of the iron core.

Magnetism And Electromagnetism - Magnetic Line of Force

Points : Magnetic Line of Force, Magnetic Line of Force Definition Path obtained by a unit magnet in the field of a magnet is called magnetic line of force.

Magnetism And Electromagnetism - Similarities between static electricity & magnetism

Similarities between static electricity & magnetism Points : Similarities between static electricity & magnetism, Right hand rule, For detection of direction of magnetic lines of forces, For detection of direction of flow of current
Remarkable similarities between Static electricity and magnetism are as follows.
• There are two types of charges, positive and negative. There are two types, of magnetic poles, North and South.
• Like charges and like poles repel each other, opposite charges and opposite poles attract each other.

Magnetism And Electromagnetism - Solenoid

Solenoid Points : Solenoid, Magnetic field in a solenoid, Direction of magnetic field, Polarity of the ends of solenoid, Polarity of the ends of solenoid, Use of solenoid Definition: Solenoid is a coil of insulated copper wires in the form of a long cylinder.

Magnetism And Electromagnetism - Methods of Making Magnets

Points : Methods of Making Magnets, Single Touch Method, Electrical Method Methods of Making Magnets A substance can be magnetizing by following methods.
• Single Touch Method.
• Electrical Method. 1. Single touch method: In this method a hard steel bar is rubbed with one end of an inclined magnet in the direction from south to north. On reaching the end ‘N’, the magnet is lifted and the same end is brought back to the end ‘S’ of the bar.

Magnetism And Electromagnetism - Few Important Terms of Magnetism and Electromagnetism

Few Important Terms of Magnetism and Electromagnetism Points : Few Important Terms of Magnetism and Electromagnetism, Magnetic field, Magnetic poles, Magnetic force, Magnetic substances, Non magnets, Ferromagnetic substances, Soft magnetic substances, Hard magnetic substances, Examples 1. Magnetic field The space around a magnet in which its magnetic effect is felt is called a magnetic field.
OR
It is a region within which the magnet can exert its magnetic force. 2. Magnetic poles Magnet has maximum power of attraction or repulsion on its opposite ends called poles.

Magnetism And Electromagnetism - Magnetic Field Of The Earth

Magnetic Field Of The Earth
Points : Magnetic Field Of The Earth Definition The earth behaves as a large bar magnet along the North South Direction with the North Pole towards the South geographic pole.

Magnetism And Electromagnetism - Demagnetisation

Demagnetisation Points : Demagnetisation, Methods of Demagnetisation, By Hammering, By Heating, By Electricity Definition Loss of magnetic property is called demagnetization. Methods of Demagnetisation: A magnet can be demagnetized by the following methods.
• By hammering
• By Heating
• By Electricity

Magnetism And Electromagnetism - Electric bell

Electric bell
Points : Electric bell, Construction Definition An electric bell is a mechanical bell that (with rare exceptions) functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing or clanging sound.

Magnetism And Electromagnetism - Circuit

Circuit
Points : Circuit, Working Definition One end of the winding is connected to I terminal T₁ and the other to a spring, which is, mounted armature. A rod is attached to the armature, the free end of the rod carries a small hammer which can strike against a bell. A very light spring is attached to a contact adjusting screw which is joined to second terminal T₂ by a wire.

Electronics

Electronics Points : Electronics, Semi-conductors, N- type semiconductor, P - type semiconductors Definition: It is a branch of physics which deals with the development of electron emitting devices and their utilization and controlling of electron flow in electrical circuits designed for various purposes. Semi-conductors: These are the materials whose electrical conductivity lies between conductors and insulators.

Electronics - Telephone

Telephone Points : Telephone, Construction, Carbon Microphone, Magnetic Earphone, Dial, Bell, Working Definition It is an electronic device, which is used, for conversation over long distances. Construction: Telephone consists of following parts,
• A Carbon microphone
• Magnetic earphone
• Dial
• A bell of alarm

Electronics - Sound Recording by a Recorder, Reproduction of Sound

Sound Recording by a Recorder Points : Sound Recording by a Recorder, Reproduction of Sound Definition When someone speak in microphone of the recorder, the recorder convert the sound waves into fluctuating electric current, which after amplification fluctuates a magnetic recording head. This continuously fluctuating magnetic field magnetizes different parts of the tape passing in front of head and sound is recorded on the tape in magnetic pattern.

Electronics - Television

Television Points : Television, Television network, Television transmission, Image formation, Formation of voltage pulses, Modulation, Transmission of carrier signals, Reception and conversion of carrier signals into picture & sound Definition It is an electronic device, which utilizes electromagnetic waves of very high frequency for simultaneous transmission and reception of sound as well as picture. Television network In a television network images of objects are transmitted along with sound by electromagnetic carrier waves from one place and are received at another distant place.

Electronics - Satellites

Satellites
Points : Satellites Definition An orbit in which a communication satellite moves around the earth but appears to be stationary at a point is called geostationary orbit. The satellites, which move along a geostationary orbit, are called hovering satellite.

Electronics - Rectifier

Rectifier
Points : Definition, Rectification, Types of Rectification, Half Wave Rectification, Full Wave Rectification

Definition
Rectifier is a device which converts alternating current (A.C) to direct current (D.C.).

Rectification
Definition
The conversion of alternating current (A.C) to direct current (D.C.) is called rectification.

Electronics - Radio

Radio
Points : Definition, Component of Radio Transmission, Radiobroadcast (Radio transmission), Relay of Message, Modulation, Reception of the Message

Definition
A radio set is an electronic device, which is designed to receive radio or electromagnetic waves in the radio range.

Component of Radio Transmission:
Radio transmission requires following two parts.
• An Antenna at a broadcasting station (Transmitter)
• A receiver (Radio Set)

Electronics - Radar

Radar
Points : Definition, Construction (Parts of Radar), Working of Radar, Determination of Distance, Uses of Radar

Definition
Radar stands for Radio Detection and Ranging.

Construction (Parts of Radar):
Radar consists of following parts.
• Transmitter
• Receiver
• Indicating devices

Electronics - Doping

DOPING
Points : Definition, Hole, Flow of Hole, p - n Junction, Formation, Forward Biased, Reverse Biased

Definition
Process by which the electrical conductivity of elements such as Silicon or Germanium is increased by adding in them a small amount of an element which has either three or five electrons in its atom is called doping.

Hole:
In p — type substances when tetravalent substance is doped with a trivalent element an unoccupied space developed due to the shortage of an electron and is known as a hole. This hole behaves like a positive charge.

Flow of Hole:
Due to the application of electric field electrons move towards hole and leave a positive charge or hole at the initial place of electron. Thus hole flow in opposite direction to that of an electron.