ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#213431 - 04/27/14 02:46 AM Electrical theory
Henry_Jackson816 Offline
New Member
Registered: 04/26/14
Posts: 2
Loc: Australia
Having trouble with one of my electrical maths problems. Any solutions or pointers would be greatly appreciated.


Attachments
Screen shot 2014-04-27 at 11.29.39 AM.png


Top
Tools for Electricians:
#213435 - 04/27/14 06:34 PM Re: Electrical theory [Re: Henry_Jackson816]
Tesla Offline
Member
Registered: 06/16/04
Posts: 1273
Loc: Sacramento, CA
As an Electrical Contractor, I stopped playing with EE puzzles ages ago.

As for the matter at hand, this is nothing but algebra with complex numbers.

It looks like it's been lifted from a Schaum's outline book.

When I was taking college Physics, the graduate students would 'mine' Shaum's all of the time. They were so lazy they wouldn't even change the variables.

This equation is either right in there or something like it.

BTW, the notation used might introduce confusion.

A bar over a variable figures to indicate that the value is a Tensor. (Vector)

http://en.wikipedia.org/wiki/Tensor

{ All vectors are tensors, too. }

http://en.wikipedia.org/wiki/Electromagnetic_tensor

( One need not go all of the way deep into QED and the rest of wave physics. )

In other settings that same bar symbol indicates DC vs AC current. So, your diagram seems odd.

In your equivalent circuit -- no such beast could actually be constructed -- ALL of the load has to pass through the resistor. The first resistor is NOT deemed to be part of the load.

In this idealized circuit the inductor and capacitor have ZERO resistance. They just bounce the current around.

I dislike the use of the L subscript for both Load and inductance.

BTW, it's strongly implied that the inductance and capacitance HAVE to balance -- perfectly -- to obtain minimum source current.

The algebra follows rather directly, doesn't it?

Best of luck.





Edited by Tesla (04/27/14 06:35 PM)
_________________________
Tesla
Top
#213437 - 04/29/14 02:42 AM Re: Electrical theory [Re: Tesla]
Henry_Jackson816 Offline
New Member
Registered: 04/26/14
Posts: 2
Loc: Australia
Good info, thanks for the reply!
Top

Member Spotlight
Member Since: 04/03/02
Posts: 6775
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 87 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 51
HotLine1 43
gfretwell 17
Trumpy 16
Ruben Rocha 13
 
Newest Members
clee512, Jdscott2005, FAIZAN, Regitest2, sureshazhagai

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals