• 2 months ago
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Hi, myself Sufal Kumar,
Physics Faculty.
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00:00Hello friends and students, in the last video we saw Ohm's law and VI graph and IV graph
00:11for ohmic and metallic conductor.
00:13Now we are starting today's session, factors affecting resistance.
00:23And here we have only three factors, otherwise theoretically we have this third factor also.
00:42And by combining these two things, this constant of proportionality rho is known as resistivity,
00:50specific resistance.
00:51And what will be their unit, rho ohmmeter.
01:00Now we are going to talk about current density, it is J vector, A is area vector, as we have
01:08studied in electrostatics and let me repeat one more thing, conductance, conductivity
01:14sigma 1 upon rho resistivity, ohm inverse, this is also known as ohm inverse or C min,
01:23that means J is equal to sigma E, E is electric field appeared on the conductor because of
01:35battery voltage, battery potential, current is like this, electric field, positive, negative,
01:43so this is also positive, negative, Vd, V is equal to El, neglecting negative sign,
01:53rho L by A, cancel, I by A, E by rho is equal to I by A, so therefore hence it is proved.
02:04Now after this there is one more small discussion, conductors, insulators and semiconductors,
02:10these three types of materials have been classified, their analysis in terms of resistivity, basically
02:19we have to do graph, graphical variation also.
02:26Now we have to do color code of carbon resistors, first know about this topic, what is it, it
02:32is very simple, it is very simple, it is very simple, it is very simple, it is very
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