Electrical Geeks

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...

  main difference: " Capacitor is a device that is used to store an electric charge. It is basically an arrangement of conductors. A capacitor stores electrical energy directly due to the creation of an electrostatic field which is created between two metal "plates". Battery is a device that consists of electrochemical cells that convert stored chemical energy into electrical energy."   CAPACITOR   A capacitor consists of two conductors which are separated by a dielectric medium.  It stores electrical charge and is capable of discharging it whenever required. It blocks Direct Current (DC) and allows Alternating Current (AC) to pass through it. Therefore, they are widely used to  extract AC components from DC + AC components.  It is basically an arrangement of conductors.  Capacitors are widely used in electrical circuits as energy-storage devices. Capacitors are capable of storing elec...

To increase Alexa Ranking of your blog you have to do some simple and major things first I will tell you about Alexa and then will give you some tips that you should do to get alexa rank easily. Our Blog is new so our blog Rank is 0. Many of Blogger says that getting alexa rank is hard to do but i don’t think so you can view the results on our blog in future. First of all to get Alexa Rank faster and easier for your blog then you have to Verify Your Site in Alexa.com . After Doing this you and your readers can view about Traffic Stats, Backlinks Counter and More. Increase Alexa Ranking To Increase Alexa Rank Faster for Your blog you have to do some major things. If Your Visitors having Alexa Toolbar then Browser then Automatically Alexa Rank Will increase faster. Always Make Quality Backlinks from Which You can Increase Your Alexa Ranking and Traffic. The Main thing is If Your Blog/Site Visitors having Alexa Toolbar then Your Blog/Site Ranking Will Increase faster. ...

 A voltage can be developed in a coil of wire in one of the three ways: 1. By changing the flux through the coil. 2. By moving the coil through the magnetic field. 3. By altering the direction of the flux with respect to the coil. The first one is that voltage is said to be induced emf and in accordance with Faraday's law, its magnitude at any instant of time is given by the formula as shown below: e = N(dΦ/dt) x 10 -8 volts where N is the number turns in a coil dΦ/dt = rate at which the flux in maxwells changes through the coil Please take note that in this method of developing an emf, there is no physical motion of coil or magnet; the current through the exciting coil that is responsible for the magnetism is altered to change the flux through the coil in which the voltage is induced. For the second and third method mentioned above, there is actual physical motion of coil or magnet, and in altered positions of coil or magnet flux through the coil changes. A ...

1-PHASE INDUCTION MOTOR For the motoring action, there must exist two fluxes which interact with each other to produce the torque. In d.c. motors, field winding produces the main flux while d.c. supply given to armature is responsible to produce armature flux. The main flux and armature flux interact to produce the torque.        In the single phase induction motor, single phase a.c. supply is given to the stator winding. The stator winding carries an alternating current which produces the flux which is also alternating in nature. This flux is called main flux. This flux links with the rotor conductors and due to transformer action e.m.f. gets induced in the rotor. The induced e.m.f. drives current through the rotor as rotor circuit is closed circuit. This rotor current produces another flux called rotor flux required for the motoring action. Thus second flux is produced according to induction principle due to induced e.m.f. hence th...

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...

SINGLE PHASE INDUCTION MOTOR The double revolving field theory can be effectively used to obtain the equivalent circuit of a single phase induction motor. The method consists of determining the values of both the fields clockwise and anticlockwise at any given slip. When the two fields are known, the torque produced by each can be obtained. The difference between these two torques is the net torque acting on the rotor.          Imagine the single phase induction motor is made up of one stator winding and two imaginary rotor windings. One rotor is rotating in forward direction i.e. in the direction of rotating magnetic field with slip s while other is rotating in backward direction i.e. in direction of oppositely directed rotating magnetic field with slip 2 - s.         To develop the equivalent circuit, let us assume initially that the core loss is absent. 1. Without core loss Let...