Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
When two inductors are joined end to end i.e. finishing end of one joined to the starting end of the other and same current flows through both the inductors, then the inductors are said to be connected in series.Inductors in Series with No Mutual InductanceConsider two inductors of inductance $L_{1}$ and $L_{2}$ connected in series (see the figure). Assume that the mutual inductance between the two coils is zero. Let $L_{T}$ being the total equivalent inductance of the series connected inductors.Suppose at any instant the current is changing at the rate of di/dt. The total induced emf in the circuit ... Read More
Induced EMFWhen a magnetic flux linking a conductor or coil changes, an electromotive force (EMF) is induced in the conductor or coil, is known as induced EMF. Depending upon the way of bringing the change in magnetic flux, the induced EMF is of two types −Statically Induced EMFDynamically Induced EMFStatically Induced EMFWhen the conductor is stationary and the magnetic field is changing, the induced EMF in such a way is known as statically induced EMF (as in a transformer). It is so called because the EMF is induced in a conductor which is stationary. The statically induced EMF can also ... Read More
Faraday’s Laws of Electromagnetic InductionMichael Faraday (an English scientist) performed a series of experiments to demonstrate the phenomenon of electromagnetic induction and he summed up his conclusions into two laws, known as Faraday's laws of electromagnetic induction.First Law of Electromagnetic InductionThe first law states that "when a magnetic flux linking a conductor or coil changes, an EMF is induced in the conductor or coil". Therefore, the first law tells about the condition under which the emf is induced in a conductor or coil.Second Law of Electromagnetic InductionThe second law states that "The magnitude of the induced emf in the conductor ... Read More
Hysteresis LossWhen a magnetic material is subjected to cycle of magnetisation (i.e. it is magnetised first in one direction and then in the other), a power loss occurs due to molecular friction in the material i.e. the magnetic domains of the material resist being turned first in one direction and then in the other. Therefore, energy is required in the material to overcome this opposition. This loss being in the form of heat and is termed as hysteresis loss. The effect of hysteresis loss is the rise of temperature of the machine.The formula for the calculation of hysteresis loss is ... Read More
When electric current is passed through a conductor, heat is generated in the conductor. This effect of electric current is known as heating effect of electric current.In practice, when electric current is passed through the element of an electric heater, the element of the heater becomes red hot, because the electrical energy is converted into the heat energy. This is called heating effect of electric current and is used in manufacturing of many heating appliances like electric iron, electric kettle etc.Cause of Heating Effect of Electric CurrentWhen a potential difference is applied across the ends of a conductor, the free ... Read More
When a current carrying conductor is placed at right angles to a magnetic field, it is found that a force acts on the conductor in a direction perpendicular to the direction of both the magnetic field and the current.ExplanationConsider a straight conductor carrying a current of I amperes. If the magnetic flux density is B, the effective length of the conductor is l and θ is the angle which the conductor makes with the direction of the magnetic field.It has been found by experiments that the magnitude of the force (F) acting on the conductor is directly proportional to −Magnetic ... Read More
An English electrical engineer and physicist Sir John Ambrose Fleming established two rules, known as Fleming's Left-Hand Rule and Fleming's Right-Hand Rule which are widely used in electrical machines.When a current carrying conductor is placed in a magnetic field, a mechanical force acts on the conductor. The direction this force is determined by Fleming's Left-Hand Rule. The left-hand rule is mainly applicable in electric motors.Also, when a conductor is moved in a magnetic field, an emf is induced in the conductor due to which an electric current flows in the conductor. The direction this induced current is determined by Fleming's ... Read More
The optical disk storage system includes a rotating disk coated with a diminished layer of metal that facilitates a reflective surface and a laser beam, which is used as a read/write head for recording information onto the disk. Unlike magnetic disk, the optical layer consists of a single long track in the form of a spiral shape. The spiral shape of the track produces the optical disk applicable for reading huge blocks of sequential information onto it, including music.Types of Optical DisksThere are two types of optical disks which are as follows −Compact Disk (CD) − The terminology CD used ... Read More
Magnetic tape transport includes the robotic, mechanical, and electronic components to support the methods and control structure for a magnetic tape unit. The tape is a layer of plastic coated with a magnetic documentation medium.Magnetic tapes are used in most organizations to save data files. Magnetic tapes use a read-write mechanism. The read-write mechanism defines writing data on or reading data from a magnetic tape. The tapes sequentially save the data manner. In this sequential processing, the device should start searching at the starting and check each record until the desired information is available.Magnetic tape is the low-cost average for ... Read More
A magnetic disk is a storage device that can be assumed as the shape of a Gramophone record. This disk is coated on both sides with a thin film of Magnetic material. This magnetic material has the property that it can store either ‘1’ or ‘0] permanently. The magnetic material has square loop hysteresis (curve) which can remain in one out of two possible directions which correspond to binary ‘1’ or ‘0’. Bits are saved in the magnetized surface in marks along concentric circles known as tracks. The tracks are frequently divided into areas known as sectors.In this system, the ... Read More