diffrence between sd card and microsd card

difference between sd card and microsd card

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Basic Principle Of Alternator

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A.C. generators or alternators (as they are usually called) operate on the same fundamental principles of electromagnetic induction as d.c. generators. They also consist of an armature winding and a magnetic field. But there is one important difference between the two. Whereas in d.c. generators, the armature rotates and the field system is stationary, the arrangement in alternators is just the reverse of it. In their case, standard construction consists of armature winding mounted on a stationary element called stator and field windings on a rotating element called rotor. The details of construction are shown in Fig. alternator The stator consists of a cast-iron frame, which supports the armature core, having slots on its inner periphery for housing the armature conductors. The rotor is like a flywheel having alternate N and S poles fixed to its outer rim. The magnetic poles are excited (or magnetised) from direct current supplied by a d.c. source at 125 to 600 volts. In mo...
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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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