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This blog is a place for electrical and electronics engineering students providing unique and quality resources and articles. It also provide information about projects of electrical and electronics.


This blog consist a lot of interview questions which are asked in most exam.

There are following topics in this blog

  • electrical machines
  • power system
  • power electronic
  • electrical measurements
  • electronic devices
  • Emphasizes the conceptual understanding of each topic, logical approach
  • plenty of illustration the theoretical concepts

My name is Prabhat. I'm an Electrical Engineering student as well as an enthusiast blogger. I am studying in the second year of B.E. (Electrical) in Rajasthan Techanical University Rajasthan, India.


I have started this blog with an intention of helping electrical engineering students to understand the basics of electrical engineering in easy words. This blog is mostly targeted to those students from countries where English is not a native language, like India. Such students find it quite hard to understand very clearly from a reference book, just because the language used in most of the reference books is really hard to understand. Do you think that basics of electrical can be understood clearly and easily from this blog. Am I doing it good? I hope that I'm keeping my words and my posts are helping you.



I like to stay in touch with my readers. So, never hesitate to get in touch.

You can always drop a mail at here or the form below delivers me your message instantly. Your every suggestion, query or feedback is always welcome.

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Practical Commutation

The e.m.f. induced in each coil of armature is alternating in nature. If load is connected, the current flowing will also be alternating. But the flow of current in a d.c. generator must be undirectional. This can be achieved by the use of commutator. When the armature conductors are under the influence of one pole they carry current in one direction whereas the current is reversed when the conductors are under the influence of other pole. This reversal of current takes place along the magnetic neutral axis. Fig. 1 Note : The reversal of current is likely to take place in short interval when a coil is short circuited by a brush so that transfer of current from one direction to other is carried out without any sparking. This process is called commutation.        Thus a process by which current in the short circuited coil is reversed while it crosses the MNA is called commutation. The time during which the coil remains short circuited is known as...
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Demagnetising and Cross Magnetizing Conductors

The conductors which are responsible for producing demagnetizing and distortion effects are shown in the Fig.1. Fig. 1        The brushes are lying along the new position of MNA which is at angle θ  from GNA. The conductors in the region AOC = BOD = 2θ  at the top and bottom of the armature are carrying current in such a direction as to send the flux in armature from right to left. Thus these conductors are in direct opposition to main field and called demagnetizing armature conductors.         The remaining armature conductors which are lying in the region AOD and BOC carry current in such a direction as to send the flux pointing vertically downwards i.e. at right angles to the main field flux. Hence these conductors are called cross magnetizing armature conductors which will cause distortion in main field flux.        These conductors are shown in the Fig. 2 Fig. 2  ...
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Armature Voltage Control Method or Rheostatic Control of dc motor

Speed Control of D.C. Shunt Motor (Part2)  2. Armature Voltage Control Method or Rheostatic Control        The speed is directly proportional to the voltage applied across the armature. As the supply voltage is normally constant, the voltage across the armature can be controlled by adding a variable resistance in series with the armature as shown in the Fig. 1. Fig. 1 Rheostat control of shunt motor        The field winding is excited by the normal voltage hence I sh is rated and constant in this method. Initially the reheostat position is minimum and rated voltage gets applied across the armature. So speed is also rated. For a given load, armature current is fixed. So when extra resistance is added in the armature circuit, I a remains same and there is voltage drop across the resistance added ( I a R). Hence voltage across the armature decreases, decreasing the speed below normal value. By varyi...
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