Monthly Archives: November 2011

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:

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 … Continue reading

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 … Continue reading

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 … Continue reading

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 … Continue reading

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. … Continue reading

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 … Continue reading

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 … Continue reading

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 … Continue reading

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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 … Continue reading