control of electrical machines by sk bhattacharya pdf

control of electrical machines by sk bhattacharya pdf

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Ohm's law, unilateral and bilateral circuit, linear and nonlinear component

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Ohm's law:                    Definition :  Temperature and other physical quantity is remain constant the electric current flowing through the conductor is directly proportional to the potential difference between two ends of the conductor.                    I  ∝  V                     I=GV    Where, V  is Voltage in volts (V) G is conductance in  siemens  ( ℧ ) I  is Current in Ampere (A) R  is Resistance in ohm (Ω)               G=1/R                             So, V=IR Limitation of ohm's law: Ohm’s law is not applicable for unilateral electrical elements like diodes and transistors as they allow the current to flow through in one direc...
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Resistivity and temperature coefficient of resistance

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Resistivity: Resistivity of any material is defined as amount of resistance shown by that material between two opposite faces of a unit cube of that material.        1) R ∝ L  (resistance is proportional to length)        2) R ∝ 1 / A  (resistance is inversely proportional to cross section area)         Combining both proportionalities gives: R ∝ L / A R = ρ (L / A) ρ = R (A / L) Unit of the resistivity is ohm-meter  Temperature coefficient of resistance: Temperature coefficient of resistance of any material is the value  that measure of change in electrical resistance of any substance per  degree change of temperature.       Sl. No. Material/Substances Chemical Symbol/Chemical composition Temperature coefficient of resistance / o C (at 20 o C) 1 Silver Ag 0.0038 2 Copper Cu 0.00386 3 Gold Au 0.0034 4 Aluminum Al 0.0042...
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