⏚ Electrical Engineering

why the rotor in a synchronous motor is excited by a dc source ?

why the rotor in a synchronous motor is excited by a dc source and stator with ac source?...why not the rotor is given a...

39 comments posted 18yrs

posted by vidhya36

39 comments posted 18yrs posted by vidhya36

Main Electrical feed into house

Hope this is the right group. I have an older home with a 60 amp service. Today for a resedetal home there is either a...

8 comments posted 18yrs

posted by rickathometoday

8 comments posted 18yrs posted by rickathometoday

ImageCraft

Hello does sombody nows were i can find an imagecraft avr compiler? Thanks

0 comments posted 18yrs

posted by Mediapointnetworks

0 comments posted 18yrs posted by Mediapointnetworks

magnetic fields

I'm on a quest to find a good book that covers information about magnetic fields as it applies to power and/or radio en...

7 comments posted 18yrs

posted by phil-news-nospam

7 comments posted 18yrs posted by phil-news-nospam

lag lead compensator

can any one explain about the lag lead compensation ?

3 comments posted 18yrs

posted by meetgayu89

3 comments posted 18yrs posted by meetgayu89

Beta field trials with 120VAC non listed power supplies

Any provision in NFPA 70 to allow for use of non-listed/recognized/ labelled 24dc power supply? presumably, it will be...

2 comments posted 18yrs

posted by jasoncardinal

2 comments posted 18yrs posted by jasoncardinal

2008 NEC 200 illustrated Changes online for free

Changes are in the form of 20 tests with 10 illustrated tutorial questions per test. Cahnges are at: http://www.electric...

3 comments posted 18yrs

posted by electrician

3 comments posted 18yrs posted by electrician

pc board crosstalk analysis

does anyone have any general guidelines and perhaps some tutorials for allegro SI for designing around crosstalk? my kn...

2 comments posted 18yrs

posted by johnnyz86

2 comments posted 18yrs posted by johnnyz86

Using Excel Normal Dist for reliability calc?

If given MTBF and standard deviation can the reliabilty be predicted at a defined operational range using Excels Normal...

0 comments posted 18yrs

posted by trs80

0 comments posted 18yrs posted by trs80

3 Phase MCB

I have a 3 section 3 phase MCB rated at 25A. Is this 25A total or 25A on each phase? TIA.

7 comments posted 18yrs

posted by thisisnotmy

7 comments posted 18yrs posted by thisisnotmy

Thyristor ON !?!

Hullo. I was asked this question during my Lab viva. " There is a circuit with SCR, without the gating circuit of the S...

7 comments posted 18yrs

posted by armundle

7 comments posted 18yrs posted by armundle

NEC Code Question

Planning a new addition to my current shop. This addition will require running 4 new circuits from my main gutter. A 60...

15 comments posted 18yrs

posted by luv2^fly^99

15 comments posted 18yrs posted by luv2^fly^99

2008 NEC requires gambling machines and many more to be on GFCI

The new definition of Vending Machines in 422.51 expands the meaning to include some rather unusual machines. For insta...

0 comments posted 18yrs

posted by electrician

0 comments posted 18yrs posted by electrician

3phase induction motor and transformer are working on the same principle of em induction only , in motor alone why rmf is produced why not in transformer?

both 3phase induction motor and transformer are working on the same principle of em induction only , in motor alone why...

7 comments posted 18yrs

posted by vidhya36

7 comments posted 18yrs posted by vidhya36

connecting fuses to phases alone and why we are not connecting for neutral?

why we are connecting fuses to phases alone and why we are not connecting for neutral?

4 comments posted 18yrs

posted by vidhya36

4 comments posted 18yrs posted by vidhya36