Ferozepur College of Engineering and Technology Ferozepur

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: Continue reading “Ferozepur College of Engineering and Technology Ferozepur”

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

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 Aevd

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

I   = nAe2E/m

Or                  I/A=ne2 E/m                            (1) Continue reading “Relation between Current density, conductivity and electric field: Point Form of Ohm’s law”

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Current Density, Conductance And Electrical Conductivity

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. Continue reading “Current Density, Conductance And Electrical Conductivity”

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Common daily life science queries – 6

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? Continue reading “Common daily life science queries – 6”

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Cause of the resistance in a wire

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: Continue reading “Cause of the resistance in a wire”

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Doaba Women Institute of Engineering and Technology Kharar Mohali

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

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Doaba Institute of Engineering and Technology Mohali

Doaba 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
  • Mechanical Engineering
  • Information Technology

Eligibility for Admission in B.Tech.

10+2 Non-Medical (PCM) passed.

Admission Procedure: – Continue reading “Doaba Institute of Engineering and Technology Mohali”

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Ohm’s law and its derivation

MOBILITY OF THE ELECTRON AND CURRENT

Mobility of electron (ue) is defined as the drift velocity of electron per unit electric field applied.

ue= drift velocity/electric field= Vd/E

Thus                                 Vd=ueE

The  SI unit of mobility is m2s-1V-1 or ms-1N-1C

As  by the relation of the current and drift velocity (already discussed)

I=Anevd (1)

By putting value of vd in above equation we get

I=AneueE

OHM’S LAW Continue reading “Ohm’s law and its derivation”

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RELATION BETWEEN CURRENT AND DRIFT VELOCITY

Let l is the length of the conductor and A uniforms area of cross-section.

Therefore, the volume of the conductor = Al

If n is the number of free electrons per unit volume of the conductor, then the total number of free electrons in the conductor=A/n.

If e is the charge on each electron then total charge on all the free electrons in the conductor

Q=A/ne                                     (1) Continue reading “RELATION BETWEEN CURRENT AND DRIFT VELOCITY”

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Desh Bhagat Engineering College Mandi Gobindgarh

Desh Bhagat Engineering College is situated in the district Mandi Gobindgarh (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
  • Civil Engineering
  • Mechanical Engineering
  • Information Technology

Eligibility for Admission in B.Tech. Continue reading “Desh Bhagat Engineering College Mandi Gobindgarh”

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