Submitted Questions

  • Ground and Earthing

    What is the difference between earthing and grounding When should I use any of both? Thanks


    • Aug 8th, 2013

    Ground and earth is basically the same thing. It’s all about providing the least path of resistance to the earth mass. Neutral is connecting the star point of three phase equipment out which serves as a return path for the flow of electricity.

    jayashree priyadarsini

    • Aug 4th, 2013

    1.grounding means connecting the live parts of the equipment to the earth where as earthing means connecting the dead parts of the equipment to the earth. 2.grounding provides return path for the f...

  • 3Phase rectified to single phase

    If I got a 380v 3-phase supply and I want to rectify it with thyristors to single phase how much voltage will I get ?What is the relationship?thanks


    • May 15th, 2012

    The dc output of the full wave rectifier is average value the amplitude of the sine wave. In short multiply the r.m.s value of the ac input voltage by its form factor (1.11 in case of pure sine wave) ...

  • Transformer with current source

    Can the transformer be operated on current source instead of voltage source ??if ,, what will happen ?

    somnath paul

    • Feb 2nd, 2013

    In case of an ideal current source , it will deliver same current irrespective of the load connected to the secondary terminals thus proper transformation will not take place in order to maintain constant flux.


    • May 23rd, 2012

    I assume that by current source you mean constant current source. In such case the primary and secondary voltage of the transformer will depend on the impedance of the transformer and the load. The lo...

  • Car alternator is a 3 phase generator.

    In the car alternator is a 3 phase generator and rectified instead of using dc generator. Why ac alternator is better than dc generator in any car?

  • When should I use fuse , mcb(b,c,d,k) tybes , mccb ?

    I mean which applications should require any of the above circuit breakers.


    • May 23rd, 2012

    MCBs have relatively low breaking capacity and sluggish compared to fuse. Fuse is used when cost of cable is a factor. If MCBs are used proper cable sizing must be done considering fault level and duration.


    • Apr 23rd, 2012

    Fuse is old technology to break d circuit in fault. MCB is for low fault currents starting 6Amps to, 63Amps either 1Phase or 3Phase. And (b,c,d,k) are depends on the fault current and the location u r going to use. MCCB for higher currents more than 63 Amps that to in 3 Phase only.