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Electricity & Megnetism

electric potential and potential difference formula and unit

Electric potential at a point in an electric field is equal to the amount of  work  done in bringing a unit positive charge from infinity to that point.Potential difference is the work done in carrying a unit positive charge from one point to another point while keeping the charge in equilibrium. Electric potential formula If  W  is the work done ...

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Difference between mutual and self induction

image of self induction of a coil

The process in which a changing current in one coil induces emf in other coil,is called mutual induction.While the phenomenon in which a changing current in a coil induces an emf in itself is called self induction. What is Mutual induction? “The process of inducing e.m.f in the secondary coil by changing the magnetic flux of the primary coil with ...

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Difference between potentiometer and voltmeter

Voltmeter Potentiometer Its resistance is high and finite Its resistance is high and  infinite It draws some current from emf source It does not draw any electric current from source of  emf  Potential difference measured by it is less than the actual potential difference Potential difference measured by it is equal to actual potential difference It has low sensitivity It ...

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Different types of electromagnetic radiation spectrum with examples

What is Electromagnetic Spectrum? The word spectrum comes from a Latin word meaning “form” or “appearance”. Other familiar words from the same root include “spectacle” and “species.” Newton introduced word to describe the rainbow-like image that resulted when a beam of sunlight passed through a glass prism. Today we speak of the electromagnetic spectrum to indicate the many different kinds ...

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State faraday’s law of electromagnetic induction

Faraday’s law of induction was discovered through experiments carried out by Micheal Faraday in England In 1831 and by Joseph Henry in the United States at about the same time. *Even through Faraday published his results first, which gives him priority of discovery, the SI unit of inductance is called the henry (abbreviation H). On the other hand, the SI ...

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Difference between resistance and resistivity in tabular form

Resistance and resistivity difference                     Resistance                          Resistivity  It is the opposition to the flow of electric current through a conductor. It is the resistance of a meter cube of a wire. Its SI unit is ohm ( Ω ). Its ...

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Galvanometer and ammeter

Galvanometer and ammeter are both current measuring devices.The galvanometer is used to measure very small current while ammeter is used to measure very large current up to 10 A. Now! We study in detail about these two instruments and we will also see the difference between galvanometer and ammeter. What is galvanometer? It is an electrical device which is used to ...

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Ammeter and voltmeter

An ammeter is an electrical device which is used to measure the current. It is the modified form of the galvanometer. It is a low resistance galvanometer. It is always connected in series with the circuit to measure current. An ideal ammeter has zero resistance. Meter movement The portion of galvanometer whose motion causes the needle of the device to ...

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Difference between electric and magnetic field

What is electric field? Coulomb’s law for the force between charges encourages us to think in terms of action at a distance represented as charge  ↔ charge. Again introducing the field as an intermediary between the charges, we can represent the interaction as: charge ↔  field ↔ charge Therefore the first charge sets up an electric field, and the second charge ...

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Types of magnetic materials with examples

There are three types of magnetic materials.Examples of magnetic materials are: Paramagnetic materials Diamagnetic materials Ferromagnetic materials Paramagnetic substances paramagnetic substances are those which are attracted by magnets and when placed in a magnetic filed move from weaker to stronger parts of the field. Paramagnetic materials examples Familiar examples are: aluminum maganese platinum, crown glass solution of salts of iron ...

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