Archive for November 2011

Ferozepur College of Engineering and Technology Ferozepur

Nov 28th

Posted by vikas in Institutes

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Ferozepur College of Engineering and Technology is situated in the district Ferozepur (Punjab) of India.

Affiliated with: Punjab Technical University (PTU), Kapurthala

Approved by: All India Council for Technical Education (AICTE), New Delhi.

Courses offered: More >

Relation between Current density, conductivity and electric field: Point Form of Ohm’s law

Nov 27th

Posted by amit_physics in Electromagnetism

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As we have already derived and discussed the Ohm’s law. Let us derive and discuss the point form of Ohm’s law which is basically the relation between current density (J), conductivity (σ) and electric field (E).

As current is related with drift velocity by relation

I=n Aev_d

I = n Ae(eE/m) ( because v_d=eE/m)

I = nAe²E/m

Or I/A=ne² E/m (1) More >

Current Density, Conductance And Electrical Conductivity

Nov 27th

Posted by amit_physics in Electromagnetism

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Current density at a point in a conductor is defined as the amount of current flowing per unit area of the conductor around that point provided the area is held in a direction normal to the current.

Let I be the current distributed uniformly across a conductor of cross-sectional area A. The magnitude of the current density for all points on that cross-section of the conductor is

J=I/A

Current density is a vector quantity. Its direction is the direction of motion of positive charge. More >

Common daily life science queries – 6

Nov 26th

Posted by winnerscience in Science

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Q:- What will be the weight of a person on moon? Will it be less or more than his weight on the earth?

Ans:- As the acceleration of the gravity of the moon is one-sixth that of the earth; therefore the weight of a person on the surface of the moon will be one-sixth of his actual weight on earth.

Q :- Why do some liquids burn while others like water do not? More >

Cause of the resistance in a wire

Nov 26th

Posted by amit_physics in Electromagnetism

1 comment

RESISTANCE AND RESISTIVITY

The resistance of a conductor is the obstruction offered by the conductor to the flow of electric current through it.

Resistance (R) of a conductor is defined as the ratio of the potential difference (V) across the ends of the conductor to the current (I) flowing through it i.e.

R=V/l

The S.I unit of resistance is Ohm. Where 1 Ohm= 1volt/1ampere=1V/1A

Thus 1 ohm is the resistance of a conductor through which a current of 1 ampere flows when a potential difference of 1 volt is applied across the ends of the conductor.

cause of the resistance of a wire: More >

Doaba Women Institute of Engineering and Technology Kharar Mohali

Nov 22nd

Posted by vikas in Institutes

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Doaba Women Institute of Engineering and Technology is situated in the Tehsil Kharar and district Mohali (Punjab) of India.

Affiliated with: Punjab Technical University (PTU), Kapurthala

Approved by: All India Council for Technical Education (AICTE), New Delhi.

Courses offered:

B.Tech.

Computer Science Engineering
Electronics and Communication Engineering
Information Technology

Eligibility for Admission in B.Tech.

10+2 Non-Medical (PCM) passed.

Admission Procedure: -

Total seats are classified in 2 categories. Institute can fill 33% of the seats (Management Quota) directly provided the students possess requisite qualification. Balance (67%) seats are filled through counseling conducted by PTU on the basis of ranking in All India Engineering Entrance Exam (AIEEE).

Website: www.dgc.edu.in/dwiet.php

Email : contactus@dgc.edu.in

Address :

Doaba Women Institute of Engineering and Technology

Village-Ghataur

Tehsil-Kharar

District: Mohali-140103

Punjab

INDIA

Phone : 09855432118, 0160-5002902, 9988850886