diffrence between sd card and microsd card

difference between sd card and microsd card

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difference between earthed and unearthed cables

Introduction: In HT electrical distribution, the system can be earthed or unearthed. The selection of earthed/unearthed cable will depend on system. If distribution system is earthed then we have to use cable which is manufactured for earthed system. (Which the manufacturer specifies). If the system is unearthed then we need to use cable which is manufactured for unearthed system. The unearthed system requires high insulation level compared to earthed System. For earthed and unearthed XLPE cables, the IS 7098 part2 1985 does not give any difference in specification. The insulation level for cable for unearthed system has to be more. Earthed System:            Earlier the generators and transformers were of small capacities and hence the fault current was less. The star point was solidly grounded. This is called earthed system. In Three phases earthed system, phase to earth voltage is 1.732 times less than phase to phase ...
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Generation of Sine Wave of Voltage

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Generation of Sine Wave of Voltage There are two facts that the voltage developed in a coil of a generator changes; the first one is it changes in magnitude from instant to instant as varying values of flux are cut per second and the other one is it changes in direction as coil side change positions under north and south poles, implies that alternating emf is generated. This means that the voltage is maximum as mentioned in our last topic here when the position of the coil is just like shown in the figure below:  then it will diminish to zero as the coil rotates clockwise toward the position as shown below: Then, as the coil continues to rotate clockwise, the polarities will change. Assuming uniform flux distribution between north and south poles, the generated voltage in a coil located from the vertical will be: e = Emsinα Consider the figure below for us to analyze why this relationship mentioned above happened.   It was come up to the relations...
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Double Revolving Field Theroy

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single phase induction motor According to this theory, any alternating quantity can be resolved into two rotating components which rotate in opposite directions and each having magnitude as half of the maximum magnitude of the alternating quantity.        In case of single phase induction motors, the stator winding produces an alternating magnetic field having maximum magnitude of Φ 1m .        According to double revolving field theory, consider the two components of the stator flux, each having magnitude half of maximum magnitude of stator flux i.e. (Φ 1m /2). Both these components are rotating in opposite directions at the synchronous speed N s which is dependent on frequency and stator poles.        Let Φ f  is forward component rotating in anticlockwise direction while Φ b  is the backward component rotating in clockwise direction. The resultant of these two co...
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