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Diode characteristics and half wave rectifier

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Dear students

  In this class we discuss the characteristics of crystal diodes and their utility as half wave rectifier. The lecture is included in the following links

For the PDF lecture notes, Click here

For video class, CLICK HERE

Thanks for visiting!

Regards...

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Quiz on semiconductor physics

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Dear students

 Try to answer the following questions!

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Physics of Semiconductors

Dear Students

In this class, the basic physics of Semiconductors are discussed.

To listen the audio class, CLICK HERE

Lecture notes are  available in the following link. For full PDF, CLICK HERE

Thanks for visiting

Regards.......

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Boundary conditions in a dielectric interface

Dear Students

In this class we shall discuss the boundary conditions in dielectric interface.

For better view of the scripted lectures, click the following images one by one.

For downloading the full PDF, CLICK HERE

For the recorded video class, CLICK HERE

(In the lecture consider E2t=0 as boundary condition when one of the media in the dielectric interface ( say, medium 1) is conductor, perhaps by tongue slip even I used sigma at the initial and last)

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Regards....

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Maximum power transfer theorem: If the internal impedance of the source is not a pure resistance

Dear Students,

        This session is focused on the conduct of online class for S5 CBCSS physics in the topic maximum power transfer theorem in the case of non-ohmic resistance networks which is included in the revised 2018 syllabus under PY1543 course (Electronics) for University of Kerala.

For better view of the scripted slides below, click on each images. The recorded video class and the full PDF of the lecture notes are provided in links posted at the end.

For recorded video class, CLICK HERE

For downloading full PDF, CLICK HERE

Thanks for visiting here

Regards.....

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Magnetic susceptibility and permeability

Online class for complementary physics for Chemistry , S3

The ratio of magnetization (M) to magnetic field intensity (H) is a constant and in general the ratio is called magnetic susceptibility. 

It is a measure of how susceptible the material is, towards the polarization by applied field. It is characteristic of the material and is denoted by Chi (m). It is infact the volume susceptibility.

The volume susceptibility is positive for paramagnetic and negative for diamagnetic materials. In both cases, the magnitude is less than one. Susceptibility of a paramagnetic material decreases with increasing temperature as per the relationship:

Combining equation (1) with the relation connecting three magnetic vectors, we arrive at the following expression.

For diamagnetic materials, the relative permeability is slightly less than unity and for paramagnetic materials it is slightly greater than unity. Thus, for diamagnets, M and H are antiparallel (think how it is ?), and for paramagnets, M and H are parallel ( also think about this case). 

Permeability is thus the measure of the degree of penetration of magnetic field through the substance.

For recorded video class, CLICK HERE

Thanks for visiting

Regards......

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Maximum Power transfer theorem

For CBCSS S5 Core physics 2018 syllabus revision, University of Kerala.

Course: PY 1543, Electronics.

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The theorem states that the maximum power will be delivered to the load when the load resistance is equal to the internal resistance of the network delivering the power.

Consider a two terminal network represented by its equivalent Thevenin's circuit as shown in figure 1.

According to Joules law, the power delivered to the load resistance is:

From equation (1b), it is clear that the power generated in the load will be maximum, when the internal resistance is minimum. When R=0, 

From equation (2), it is evident that P is smaller than P(Max). From equation (1a), it is apparent that, power in the load is zero, if the load resistance R(L) is very small. Also, from equation 1(b), it very clear that the power in the load is also zero, when R(L) is very large. 

Thus there must have an optimum value for load resistance ,R(L) for which power delivered in the load will be maximum.

Thus for finding this optimum value for maximum power transfer, we need to differentiate equation 1(b) with respect to R(L) and equate the result to zero. Thus we get:

Thus the theorem is proved. That is, for maximum power to be delivered to the load, the load resistance should match with the internal resistance of the circuit. If a graph is plotted between the load power and the R/R(L), the curve so obtained is shown in figure (2).

Efficiency

If the source power is P(s) and the maximum power delivered is P(max), then the efficiency is P(max)/P(s). It can be shown that efficiency of a network is 50%.

This means that half the power is lost with internal resistance of the network.

For recorded video class of the topic, please CLICK HERE

Thanks for visiting here!

Regards.....

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The three electric vectors (E, P & D)

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Online class for CBCSS S3 Physics core 

On 15/06/2020 at 8.30 am to 9.30 am.

Dear Students,

The topic, three electric vectors is the part of revised 2018 CBCSS physics syllabus of University of Kerala, which is included Unit 2 (Electrostatic fields in matter) of PY 1341 course entitled Electrodynamics.

The audio class in Malayalam and the full PDF of the scripted lecture are provided at the end!!

For the better view of the scripted lectures, please click on the images below, one by one.

#IMPORTANT LINKS

For downloading audio class, CLICK HERE

For downloading the full PDF, CLICK HERE

Thanks for visiting

Regards....

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