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Yogita Ingle 5 years, 1 month ago
Saturation current is a term used in relation to semiconductor diodes. It is more fully named reverse saturation current and is "part of the reverse current in a diode caused by diffusion of minority carriers from the neutral regions to the depletion region.
IS, the reverse bias saturation current for an ideal p-n diode is given by,
where
<dl> <dd>IS is the reverse bias saturation current,</dd> <dd>e is elementary charge</dd> <dd>A is the cross-sectional area</dd> <dd>Dp,n are the diffusion coefficients of holes and electrons, respectively,</dd> <dd>ND,A are the donor and acceptor concentrations at the n side and p side, respectively,</dd> <dd>ni is the intrinsic carrier concentration in the semiconductor material,</dd> <dd>τp,n are the carrier lifetimes of holes and electrons, respectively.</dd> </dl>Posted by Chandan Yadav 5 years, 1 month ago
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Jashanpreet Singh 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Eddy currents
- Eddy currents are induced currents in the body of conductor when subjected to changing magnetic flux.
- They are also known as Foucault current after the name of the scientist Foucault.
- They are known as eddy currents as they are in the pattern of eddiesin the water.
- Consider an electromagnet when attached to battery because of the current magnetic field will be produced which will induce current in the metallic plate.
- The current will be in the form of eddies.
- The metallic plate will be slightly drifted in the air because of eddy currents.
Omprakash Kumar 5 years, 1 month ago
Posted by Debasis Jena 5 years, 1 month ago
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Posted by Sneha Vishwakarma 5 years, 1 month ago
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Meghna Thapar 5 years, 1 month ago
An emf induced by the motion of the conductor across the magnetic field is a motional electromotive force. The equation is given by E = -vLB. This equation is true as long as the velocity, field, and length are mutually perpendicular. The minus sign associated with the Lenz’s law.
Let us take a rectangular coil, a metal rod of length L, moving with velocity V, through a magnetic field B. There is a magnetic field at some location.
Length, velocity and magnetic field should always be at a right angle with each other. The direction of the magnetic field is going inside. Assume the metal rod is frictionless that means there is no loss of energy due to friction and we apply a uniform magnetic field. The conductor rod is moved with a constant velocity and placed in the magnetic field.
<section> </section>Posted by Deepak Sharma 5 years, 1 month ago
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Gaurav Seth 5 years, 1 month ago
The simplest version of Ohm's law: V = IR
where V is the voltage drop across a resistor of resistance R when a current I flows through it.
Let us generalize this law so that it is expressed in terms of E and J, rather than V and I.
Consider a length l of a conductor of uniform cross-sectional area A with a current I flowing down it.
In general, we expect the electrical resistance of the conductor to be proportional to its length, and inversely proportional to its area (i.e., it is harder to push an electrical current down a long rather than a short wire, and it is easier to push a current down a wide rather than a narrow conducting channel.)
Thus, we can write
=>R=ηlA=>R=ηlA
The constant ηη is called the Resistivity, and is measured in units of ohm-meters. Ohm's law becomes
=>V=ηlAI=>V=ηlAI
=>Vl=ηIA=>Vl=ηIA
However, IA=JxIA=Jx (supposing that the conductor is aligned along the x-axis) and Vl=ExVl=Ex, so the above equation reduces to
Ex=η.JxEx=η.Jx
There is nothing special about the x-axis (in an isotropic conducting medium), so the previous formula immediately generalize
E=η.JE=η.J
This is the vector form of Ohm's law.
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Yogita Ingle 5 years, 1 month ago
Kirchhoff’s First Law or Junction Rule The algebraic sum of electric currents at any junction of electric circuit is equal to zero i.e. the sum of current entering into a junction is equal to the sum of current leaving the junction i.e.
Junction law supports law of conservation of charge because this is a point in a circuit which cannot act as a source or sink of charge(s).
Kirchhoff’s Second Law or Voltage Rule In any closed mesh of electrical circuit, the algebraic sum of emf’s of cell and the product of currents and resistance is always equal to zero i.e.
Kirchhoff’s second law supports the law of conservation of energy. Because the net change in the energy of a charge, after the charge complete a closed path must be zero
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Sunidhi Taya 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
In physics, electrostatics deals with the phenomena and properties of stationary or slow-moving electric charges. Electrostatic phenomena arise from the forces that electric charges exert on each other and are described by Coulomb’s law. Even though electrostatically induced forces seem to be rather weak.
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Kanishk Rawat 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Electric Charge Charge is the property associated with matter due to which it produces and experiences electric and magnetic effect.
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Shivani Thakur 5 years, 1 month ago
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Faraday’s – First Law of Electrolysis
It is one of the primary laws of electrolysis. It states, during electrolysis, the amount of chemical reaction which occurs at any electrode under the influence of electrical energy is proportional to the quantity of electricity passed through the electrolyte.
Posted by Vishwa Murud 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
An electric dipole is defined as a couple of opposite charges q and –q separated by a distance d. By default, the direction of electric dipoles in space is always from negative charge -q to positive charge q. The midpoint q and –q is called the centre of the dipole. The simplest example of an electric dipole is a pair of electric charges of two opposite signs and equal magnitude separated by distance.
The SI unit of dipole moment is Coulomb.meter
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Yogita Ingle 5 years, 1 month ago
Differences between the electromotive force and potential difference:
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